Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8baf27c0f79912…

MALICIOUS

PDF

66.6 KB Created: 2020-12-24 13:32:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c7e03a0547ecbcd95f729d4a27c346ae SHA-1: 945a65e1b23a95b5f3011e1564eededaf1fe9a8f SHA-256: 6a8baf27c0f799125a62d687ef2599484157d3dc42b7a75468d4771c84be6339
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's purpose is to redirect users to potentially harmful sites.

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 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://trafficel.ru/aws?utm_term=uppercase+and+lowercase+letters+worksheets PDF link annotation
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/palasewadibuxidowata.pdfIn PDF document text
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/6295632.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/kuvibusujuwezij-giwigupi-pagepavorapij.pdfIn PDF document text
    • https://diwopasod.weebly.com/uploads/1/3/4/4/134475510/8887111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f91f8f09b871.pdfIn PDF document text
    • https://bogezozoxo.weebly.com/uploads/1/3/4/4/134479702/ad6b4656bba.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/1701de.pdfIn PDF document text
    • https://dipakexamima.weebly.com/uploads/1/3/1/0/131069759/9e0109.pdfIn PDF document text
    • https://cdn.sqhk.co/riwajamugem/hbsrhbs/55946274047.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/id9hjib/ice_cream_delivery_nyc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_5f92bf7e49dfd.pdfIn PDF document text
    • https://wosufixojiniki.weebly.com/uploads/1/3/4/7/134720754/watiw-vewusebaneguv.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/cbe6ecd1-91fd-4ee6-a239-13a3d95f41e5/calamansi_find_friends_among_us.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e96a02-5cff-4e45-a024-48e69affe3ad/56370144468.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CE 5308 bytes
SHA-256: 6147aa1f9486020db8cee42f3b82fda0b7be732fd4311b8e37c8b78108cdee7a
font_01_sfnt_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 10036 bytes
SHA-256: 89a69bb4dfbd34751badcc46f74aa49d573aa0570f9c9e225117dbd1a490dd38

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