Malicious PDF — malware analysis report

Static analysis result for SHA-256 020a6bee03825489…

MALICIOUS

PDF

90.3 KB Created: 2021-04-12 22:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9a16329e263ec061329e9802f8474277 SHA-1: 559f29b00a831d2c57b5d86df8127669f99fab0f SHA-256: 020a6bee038254895beb30eca44d7946a0b5c8422e07309e4f15dbd212c5071d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary malicious URL identified is fokemale.ru, which is likely used for phishing or to serve further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/strik?utm_term=books+like+nicholas+sparks+see+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388416/normal_6023ea266aab7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471692/normal_5fee684fd0c61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408195/normal_5fc8d38116d6c.pdfIn PDF document text
    • https://tanedozuwo.weebly.com/uploads/1/3/4/6/134644204/fuxepositotigalo.pdfIn PDF document text
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/4db181a00789.pdfIn PDF document text
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/8796506c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a825dfcd-d941-4107-8580-839ea9a87a62/31569064760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/008d1c38-497f-46d9-934f-f93861ebe5ec/pulgadas_a_milimetros_fracciones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3056f5d9-2d72-4689-9b01-54acb7402cea/vofujetem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d4f3f7-fe55-46f6-99a5-a91e26986804/chipotle_breakfast_burrito_sauce.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_c458c4f4b4a04e11b4b1c9c558635528.pdf?index=trueIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_75995cb7d9f74db3aac85a19b56ba49d.pdf?index=trueIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_5f4940cd859e467d8615f186e154c56b.pdf?index=trueIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_961e7a460bb748609e1d9e1481210110.pdf?index=trueIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_4091b36f3ccd44d79aab872a1d53ebf7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/170023a8-217a-4f78-83a0-c980894f6bec/how_to_dispose_old_clothes_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01b1fe19-47c9-4d58-bf36-01150482a2cf/sta-rite_pool_pump_manual.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_c356c5e3caa2465eb7cae6e47ae325f6.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_56e658a480864a788862b5da59f2b908.pdf?index=trueIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_c654c68cd2d546ea9b4d5339033d0540.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc75e1b-1c16-42fd-b84a-acfaf35f0df8/shadowrun_rpg_maps.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 6440 bytes
SHA-256: 705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf
font_01_sfnt_off00010d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 5284 bytes
SHA-256: 92a49d39b70149439be58042f64df94117815872f51e13373243fe50698e2d32
font_02_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 10544 bytes
SHA-256: a08165bc497a961e923b3cf4d6cb5d4443d16f92687f6448ef9f0a6fb1b8629f
font_03_sfnt_off00014359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14359 16376 bytes
SHA-256: 4954ddec54c61b6acc7eddbac306bc890d05f3afdfcf3ae890c7612da0a7d668

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