Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cd865fafa62eb1…

MALICIOUS

PDF

96.0 KB Created: 2021-03-04 19:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 676b12ee2041f20bc3fbe05f266c94d3 SHA-1: 263af8afb769016f3b403087d14acac6bd0e878a SHA-256: a7cd865fafa62eb11ae8ea0e588b67d70b8b4448d6b937feaa609f9b618820ae
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=tree+of+life+bookstore+sau PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367278/normal_60410daf9221c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_602afa6b9c1f2.pdfIn PDF document text
    • http://summerita.fun/97965947953hvn8l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443812/normal_60386beb47451.pdfIn PDF document text
    • http://hurleyshamburgers.com/annual_report_pt_indofood_tahun_20147jryk.pdfIn PDF document text
    • http://minuette.me/nupuxegolidaxoz87a97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_5ffbfedac2cce.pdfIn PDF document text
    • http://wivajipozoxig.iblogger.org/99397617082.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/87421798-3595-40f7-a9bb-a10cb800997b/zezanuxitaxekivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c87e6da-2c45-40a7-b73a-fa43d30961da/rugadiw.pdfIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_adf8e60af1464f4a8420c51897939752.pdf?index=trueIn PDF document text
    • http://regisebe.epizy.com/85197852934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3a393e-8690-4184-b9fc-82604d518720/the_fall_guy_season_3_episode_4.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_9b9c94441e334ce89abc78c56bcd2c07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb55a83-7a9d-42f0-b3ad-0502e9590d99/ruzunepesuliweveduzonukeb.pdfIn PDF document text
    • http://nolonogatifotop.epizy.com/guided_access_iphone_turn_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e3e1114-2ca8-4366-991f-3cfd75ebf8f2/77345404303.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_762a938c842f46e49fc9c74cae03cecb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a63ebde-6474-4787-a420-6ef8b2149ba5/vida_y_muerte_en_la_mara_salvatrucha_full_book.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_off00013c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5F 4912 bytes
SHA-256: b7b80dc26f0c955066fd3c6387ded22e38209c4b0a169275b9f2f012ae776694
font_01_sfnt_off00014d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D23 11464 bytes
SHA-256: a044bbb7b052f6831e16fdd73e5a715db04a0e5db6e3c1eb8fb92deb1859a757

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