Malicious PDF — malware analysis report

Static analysis result for SHA-256 b043269967334f1e…

MALICIOUS

PDF

69.2 KB Created: 2021-05-05 14:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f8dae50425f6bba11afd2d6d29beedb0 SHA-1: b0488f063ab89b2fb20b115933fa282bf8ad2bd1 SHA-256: b043269967334f1e641649e2cf7a9de639ebe81d5e3c2e2285fd8dff6b64d326
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting and utilizing UTM parameters, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

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
  • 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.
  • 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://xajibur.ru/strik?utm_term=how+to+charge+braava+380t PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493610/normal_60158662b0ff3.pdfIn PDF document text
    • https://cdn.sqhk.co/figotabam/M4gidgc/tesabidanigip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453100/normal_60082b0d701d4.pdfIn PDF document text
    • https://cdn.sqhk.co/gesafafo/Yhjji4s/31812822792.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/u5jjm56/rush_limbaugh_health_news.pdfIn PDF document text
    • http://wowogobofomufu.mygamesonline.org/is_our_lady_of_the_lake_university_a_private_school.pdfIn PDF document text
    • http://sutezesibopixiv.medianewsonline.com/danejolokebag.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/60361170659.pdfIn PDF document text
    • https://kufurana.weebly.com/uploads/1/3/1/4/131482954/4534131.pdfIn PDF document text
    • https://nozozolaxiwuf.weebly.com/uploads/1/3/1/4/131453540/9154569.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/jP7jggf/facebook_marketplace_scams_seller.pdfIn PDF document text
    • https://mokabeninenaji.weebly.com/uploads/1/3/4/0/134013120/6be8ddacb6dc.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/SR0ieje/37755422688.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/bezutu/solving_exponential_equations_using_logarithms_worksheet.pdfIn PDF document text
    • http://fazovalekotevo.onlinewebshop.net/diablo_2_remastered_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/pijemibatobazifitar.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_off0000d154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD154 5604 bytes
SHA-256: 07879e79fc7ddc533a1d48448f5465d7cf842af4d76683b0e04839e8c8492727
font_01_sfnt_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 10244 bytes
SHA-256: 3734a2d167c00da36611840bbed209d50ab98b90f7600c87c9e9708465b229c7

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