Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0c8332da51a588…

MALICIOUS

PDF

96.6 KB Created: 2021-02-13 14:55:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9863f1ff8686633acfad3ec1fb7af0cc SHA-1: 9a1fbb6a7b7e03a8d91611cceb7287f21fb6cc14 SHA-256: fb0c8332da51a58801a5dd57c45c3beaf4cc19734a6d4b70bf25f8c083253a61
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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/123?utm_term=billy+madison+number+one+song In PDF document text
    • https://static.s123-cdn-static.com/uploads/4370062/normal_6004b6dc10ada.pdfIn PDF document text
    • https://feronodi.weebly.com/uploads/1/3/0/8/130813799/funivoguliga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_601365c1280f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_5fdc27afda3b8.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/hjvFSgj/selegubozarupefabukud.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/jhgijgc/carpentry_courses_for_adults_near_me.pdfIn PDF document text
    • https://dojosofezi.weebly.com/uploads/1/3/5/3/135390984/9780881.pdfIn PDF document text
    • https://jadetikoj.weebly.com/uploads/1/3/5/3/135350844/6424027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_60252b08d558c.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/YgDhewg/dodge_city_kansas_warrant_search.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/aLMjtgc/rufuturaxarez.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/hdhggi1/jinuguzavakezatakepisoj.pdfIn PDF document text
    • https://cdn.sqhk.co/jivaduzar/T4Kgfhh/tejuribores.pdfIn PDF document text
    • https://xamoguxa.weebly.com/uploads/1/3/0/8/130874300/e581d330eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/robumuduluwise/fejegi.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/judepawedevijexode.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/nero_burning_rom_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/67264631381.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/62780879672.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/jerisoxiwuwuvuba.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/43138342839.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off00012d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6E 5236 bytes
SHA-256: ffbae84481442bc1c1aa9f37e3f15af0372ca7ccc3e90bf255db24d547883e2b
font_02_sfnt_off00013f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F16 10920 bytes
SHA-256: 4cda6033778094392e1fab03e65069fa488d4fef169f53f94430529e510dbbc0
font_03_sfnt_off00016437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16437 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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