Malicious PDF — malware analysis report

Static analysis result for SHA-256 969d63616774b607…

MALICIOUS

PDF

75.2 KB Created: 2021-05-28 22:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3b256d4846749d1e520312bcab914322 SHA-1: 938348ff30f2e56517dc8d6717bf212207d380c7 SHA-256: 969d63616774b6076c9241a387e630837a497b18004bada568c3e00108ecc68c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure for a free textbook download, which is a common social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=dm+vasudevan+textbook+of+biochemistry+9th+edition+pdf+download+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415331/normal_5ffab1c82d35b.pdfIn PDF document text
    • https://wapefoko.weebly.com/uploads/1/3/5/3/135337073/7135474.pdfIn PDF document text
    • https://mugibutu.weebly.com/uploads/1/3/4/7/134714928/pikipot-vodopemenojuje-mutazoluwolu-xitoval.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_60353f4669b3e.pdfIn PDF document text
    • https://zajolapa.weebly.com/uploads/1/3/0/7/130776493/xinabirigije_givilaxujeko.pdfIn PDF document text
    • https://kujepilam.weebly.com/uploads/1/3/5/3/135343620/3020084.pdfIn PDF document text
    • https://rogetaguw.weebly.com/uploads/1/3/1/4/131407632/4cbff6333.pdfIn PDF document text
    • https://siziloxa.weebly.com/uploads/1/3/4/7/134747516/302a68250837c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_606b05cceab69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_601b61a40f29f.pdfIn PDF document text
    • https://waderiraxobo.weebly.com/uploads/1/3/4/5/134505054/bc3358548705d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5fd36a5577595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454681/normal_5fd7bd9d9237c.pdfIn PDF document text
    • https://bajekilirevi.weebly.com/uploads/1/3/4/8/134868337/b00e305bdf0507.pdfIn PDF document text
    • https://wikifezetusu.weebly.com/uploads/1/3/5/3/135306480/bajelepeluza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417206/normal_602e103cc3093.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/13e31a37-049a-4a41-9ec6-b65a0a9a0e50/27929170069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/407f30fc-5755-4105-a813-ca73c6faf7fe/how_to_really_win_the_lottery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3e7d8f-04c0-40ce-aea3-e54b3b41b62e/where_is_the_manual_eject_screw_on_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3775fe07-21fc-41d0-898c-1750a8be9551/special_relativity_for_the_enthusiastic_beginner.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_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 6076 bytes
SHA-256: 21dbb854bbf5e2b2d7e970b02a50f05c1d29f9b4d82f9a8445b7b043642ab761
font_01_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 11140 bytes
SHA-256: 2d69f8b6aa028145d55920caab70f53d5b6dc4e97a95c14f532d3310f6b19e11

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