Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8a5c5ccf1232fe…

MALICIOUS

PDF

67.9 KB Created: 2021-04-05 14:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 58be9d82fab2cf8862c541bb2504d467 SHA-1: 9bb1d22517bd9d1cadb196306df6c7d1eaabf082 SHA-256: fd8a5c5ccf1232fe0cee9cfa45ff2064734dc1cde4b2ab0483ebd770b6ee2131
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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 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.
  • 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://xajibur.ru/strik?utm_term=what+is+the+literal+meaning+of+the+rocking+horse+in+the+rocking+horse+winner PDF link annotation
    • https://nagorulanol.weebly.com/uploads/1/3/4/4/134465391/nifadazujix.pdfIn PDF document text
    • https://renikafajuwigag.weebly.com/uploads/1/3/4/3/134317319/wijav-tifoduredufesu-zerakozavamovi-janupurevapejo.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/metro_valencia_mapa.pdfIn PDF document text
    • https://lotitarep.weebly.com/uploads/1/3/1/3/131383228/2e8653c94622.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/27780189665.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/goviwigax/vigujafup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1831e968-b04a-49af-9530-b62f322c0158/guardian_ad_litem_for_adults_michigan.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_b0c42fcc82aa4be68aeb97d93e4d8c37.pdf?index=trueIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_ff0d937eaf4a404ea5a1dbf9888cc0a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e137d59f-415b-4701-bb7f-d617bca0a449/how_much_money_in_tax_havens.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/26344977651.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/83517219538.pdfIn PDF document text
    • https://148d48ef-a78d-4e34-a4d2-755cfbac042a.filesusr.com/ugd/ccca9b_05e8809d9e75472ba3fb2c6d01920370.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xefejevife/music_awards_august_2019_performers.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/are_wall_push_ups_good.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/gimetedugisunepuxawuxij.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/how_many_years_do_you_get_for_3_felonies.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC41 5464 bytes
SHA-256: 7ae60f190fc68bcded5bc67b39757a1072a41945c1a3ab75f236454909b6eb12
font_01_sfnt_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 10336 bytes
SHA-256: 447f89742a8089eb779180425280e3bd47cb4d64cc9fb7750f093eb5def7c2dc

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