Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d62e28493da8fd3…

MALICIOUS

PDF

75.7 KB Created: 2021-04-30 19:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c26cd7eb1cf687121237d5ea8bb40972 SHA-1: 23cfdbce367f206e13bf04ebc3d8ab8e30f08162 SHA-256: 2d62e28493da8fd33fca515abc7b34144cc5179fdab1c396dfa5ab0fe09827b9
186 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 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://leonvi.ru/strik?utm_term=are+cats+better+than+dogs PDF link annotation
    • https://deserekinubolid.weebly.com/uploads/1/3/4/3/134319780/440565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_602f61c081720.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/NSTpibZ/fake_call_plus-_prank_call_app.pdfIn PDF document text
    • https://solawelosadi.weebly.com/uploads/1/3/1/8/131857655/0cba22f992795.pdfIn PDF document text
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/sabuk_tekakefo.pdfIn PDF document text
    • https://cdn.sqhk.co/gasidonoda/idjgjda/78996152996.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487623/normal_5fe2757f9304e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5fdb60af4ca3e.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/gehbNif/dario_health_strips.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_602a13435d9e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5fff56afebeaf.pdfIn PDF document text
    • https://baxemajoxololur.weebly.com/uploads/1/3/1/0/131070692/1491477.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/d098eaf9-301e-4d6c-bee7-ccae9497d85e/33041283671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edae063b-33a4-4cbe-828c-8701d229a2ec/jajitozajejazewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47bcabf1-f23a-424d-bfb4-b6dcc2edfc14/what_alice_forgot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b3cf4cb-8981-4bc9-b509-a25b50bedfd3/41262280012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1912aff8-0d17-4323-8705-6c16875536ea/how_to_build_a_easy_bat_house.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0889ac39-293b-4cf4-9825-459ccb4de7b1/67433012005.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_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 5300 bytes
SHA-256: 0ddbe0738659955d11508d74044b0f690b7141df0f2658ff09f5495f86da74f1
font_01_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 10932 bytes
SHA-256: 4205ad88c3ad2367225c2b10f98a40c2f1973237deb286f2ef3282612566f60e

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