Malicious PDF — malware analysis report

Static analysis result for SHA-256 f965a03668000172…

MALICIOUS

PDF

68.5 KB Created: 2021-02-10 20:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6cf7b1367a94a657719f9b85f9b743c9 SHA-1: 95c6908b14942d02b0cba9a7dc6289c5fe6ae980 SHA-256: f965a0366800017245b809b2bc5447677b9419c628af316764b5653c23c71430
252 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/aws?utm_term=the+aerospace+corporation+email+format In PDF document text
    • https://tenimuleletef.weebly.com/uploads/1/3/4/3/134343202/e1202520f4e756.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/5845164.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/pakawu-rosidonopibixim-rolifefaxejis.pdfIn PDF document text
    • https://jebilazi.weebly.com/uploads/1/3/1/8/131856389/2267169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393514/normal_5fd37a1c93edb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_5fd323099f1e3.pdfIn PDF document text
    • https://cdn.sqhk.co/bizewavaxug/fjjhgji/gold_bunny_bookends.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/7jjgcTl/31697222087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_6017b4c7cb9e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_6014c58b6e507.pdfIn PDF document text
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/nojomuma_derab_xogozilo_lenekuluvu.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/bgeTidH/pokemon_quest_switch_to_mobile.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/litunux/pebewokesi.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/45839178542.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/21970649610.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_off0000cd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD62 5204 bytes
SHA-256: ff6b7a6547b69227b17aed94408ecbb59929d13c7b3af0fd0e4524f02d3745ef
font_01_sfnt_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 11252 bytes
SHA-256: ae36a056a13bd8bf3d1320e812234eeff083f6516cde01807c0a8d4a52eccafd

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