Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5653fda2576d2f8…

MALICIOUS

PDF

170.7 KB Created: 2021-05-13 09:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 75cd1fd4bffd09b5c5d710d11c11da8c SHA-1: 96a5a10cfa48675e40e20f56ee3f381db0c4c5c6 SHA-256: b5653fda2576d2f867c2acee0754bae2cd15d504919e2c8aeb0bfc37a6066342
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=keystone+k100+8mm+projector+bulb PDF link annotation
    • https://wasefopepaseb.weebly.com/uploads/1/3/1/8/131856398/b3a356912653417.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/jdhc1Fl/phage_display_antibody_library.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/Fhc6gcU/injustice_2_mobile_full_roster.pdfIn PDF document text
    • http://salleapp.xyz/how_to_use_symbolism_in_literature2wjix.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/hcgfrgj/91749640480.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/nedemagasadejep7h4.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/65516249922.pdfIn PDF document text
    • http://nesobaka3.xyz/miwowux5ozwb.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/jghhjhh/dynasty_warriors_like_games_ps4.pdfIn PDF document text
    • http://vvinorama.website/33939597883gnp3n.pdfIn PDF document text
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/1862745.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/gejeaii/61745962535.pdfIn PDF document text
    • https://vipobonufemug.weebly.com/uploads/1/3/5/4/135401160/fikigixesadot.pdfIn PDF document text
    • https://nafusulujaj.weebly.com/uploads/1/3/4/5/134596397/vapapapum_nedogaxa_lamebevubopajo_jasoraxat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aeedc83c-a41d-4179-9d48-e770e4c4cd47.filesusr.com/ugd/e010a7_e7103299085e4a449d5481da2f5ed6cb.pdf?index=trueIn PDF document text
    • http://defakulid.atwebpages.com/bibtex_generator.pdfIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_452172c97697496983afbd6deb513d39.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_627b1b32642e4cf4a306db627efb4650.pdf?index=trueIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_2a5a054c696c405f979e77b62d53824a.pdf?index=trueIn 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
    • 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_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 114664 bytes
SHA-256: 031bcd6e0c9413024f85bf460d7b9eacf1729b51ef00387109e548ecb68bf68c
font_01_sfnt_off00024c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C92 5608 bytes
SHA-256: e647fd5f35915034baf4c6605c5acfe6ad23f644e6359760fccaae24ccb1ebbc
font_02_sfnt_off00025fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25FB1 10804 bytes
SHA-256: 2a61302679f52433de428be694b2f9c6fd29b4ab178162c36860e1159bee0885
font_03_sfnt_off000284ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x284CA 16592 bytes
SHA-256: 372fd405ce6fe2ead96b7029720955e3c8708823118941cc74103a46facab515

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