Malicious PDF — malware analysis report

Static analysis result for SHA-256 be81696aed861fd0…

MALICIOUS

PDF

66.0 KB Created: 2020-12-20 03:53:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8a4f8f0fd37f18b71b8495df4d531014 SHA-1: ca2ee2ccaff91f2382e03d12132334d6e3069975 SHA-256: be81696aed861fd0bb26b7304ee40c4761146f0e6b72593754e5c1de3f3d08c0
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and identified as a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. ClamAV also detected this file as Pdf.Phishing.Trojan, suggesting a malicious intent behind the link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=is+saltwater+a+mixture+compound+or+element In PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/fisigovobo.pdfIn PDF document text
    • https://sorozodosunew.weebly.com/uploads/1/3/1/3/131381031/220587.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/tokoki-kadufijofo.pdfIn PDF document text
    • https://rojobasexadef.weebly.com/uploads/1/3/2/7/132711954/wopebop-fudajomada-vojopibawiso-vimug.pdfIn PDF document text
    • https://bobenetawif.weebly.com/uploads/1/3/4/6/134666578/gagese.pdfIn PDF document text
    • https://xebivonejawaf.weebly.com/uploads/1/3/4/0/134096192/0e4cea81d9426cf.pdfIn PDF document text
    • https://gebikatewizej.weebly.com/uploads/1/3/4/3/134311033/lisozozupovime-makenotes-wojukilamogafej.pdfIn PDF document text
    • https://gilijopagexoda.weebly.com/uploads/1/3/4/7/134713479/jipinixitubek.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/zedudo/vehicle_tracking_system_project_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90271af-94b3-43ac-bc73-07b16ecd48be/the_green_room_white_house.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f30a0b-20b0-4ab8-9251-bc3327786200/envision_algebra_2_answer_key.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_off0000c64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64E 5316 bytes
SHA-256: c5c9737c8f58400880b886152e0e8b66202d8fa7789c8260762a56c09b5e8935
font_01_sfnt_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 10148 bytes
SHA-256: 57431c9b19d02539ef1129dbc344c92a3d6964845c6d014b3240bb8f9c8da8a8

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