Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cac636dffbf1e9…

MALICIOUS

PDF

78.6 KB Created: 2020-12-30 01:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a3f29f590256ba3a0276ce06c510b2c5 SHA-1: 965471d67ce71e6382d5f29554df5963865d4adc SHA-256: 41cac636dffbf1e9da5dbf5698c4932da2d733534b22a02898f5f264bf3cc56e
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to disposable hosting, designed to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • 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://traffmen.ru/123?utm_term=partes+de+la+flores+para+ni%25C3%25B1os In PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/df0a3bffebe0.pdfIn PDF document text
    • https://mupififidimob.weebly.com/uploads/1/3/4/2/134234858/9831702.pdfIn PDF document text
    • https://gufekesunix.weebly.com/uploads/1/3/4/8/134888283/bozinuxeba.pdfIn PDF document text
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/1067879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_5f8b5cd56fe86.pdfIn PDF document text
    • https://pegejapadeju.weebly.com/uploads/1/3/4/3/134355249/gidenu.pdfIn PDF document text
    • https://darugagoremu.weebly.com/uploads/1/3/4/5/134588092/8463208.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/5277967.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/zifozujiwi/bacteriology_mcqs_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5001a671-3fdf-46bd-9293-ca1dccbc2af8/john_deere_la110_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa745ff0-f150-47fc-b0f3-b66a1b6239b7/wh_smith_opening_hours_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e4063c9-7504-40c2-9bbb-378e78ed3d09/west_hall_middle_school_rating.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/long_and_short_vowels_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0475b28c-b7ad-42bd-a2f6-c62aba625df4/31150645060.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 5248 bytes
SHA-256: a19c5c465b77f03d7dc4151b9b533e4dd8fbf4ef28eec51ba9266a7238e02481
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 11208 bytes
SHA-256: c9393884468008267492fc014790fc430be66161a199b88cfb54659fbfeb6c19
font_02_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 16028 bytes
SHA-256: 0bae8649ba252bcfab81cb8324cfe1737d73e47191b507e117e6d0858e0066a8

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