Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afe344752051451…

MALICIOUS

PDF

77.0 KB Created: 2021-03-15 10:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1e14208cc1f2d5e087430949e6634dcf SHA-1: 9b04f9d24f4d3cfb7d7df0a2825884b3f51a1fc0 SHA-256: 4afe34475205145167955ede396aa6af365dd77f74dfb7b37f98fc8abcd62fec
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, contains references to 'bluestacks apk handler' and 'wkhtmltopdf', suggesting a lure to a malicious site. The presence of external URIs and link farm heuristics indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=bluestacks+apk+handler PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457868/normal_5fe7727ac4df2.pdfIn PDF document text
    • https://wasaxedunup.weebly.com/uploads/1/3/1/4/131453111/aa8f4e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475716/normal_60020c935ec85.pdfIn PDF document text
    • https://xixozikitep.weebly.com/uploads/1/3/4/0/134097223/vipaw.pdfIn PDF document text
    • https://fatomokoke.weebly.com/uploads/1/3/4/0/134098041/5273267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_60364afc6634d.pdfIn PDF document text
    • http://tusuvopub.22web.org/george_foreman_evolve_grill_cooking_times.pdfIn PDF document text
    • http://vivezotutune.iblogger.org/bridgman_anatomy.pdfIn PDF document text
    • https://bovidekomuburo.weebly.com/uploads/1/3/5/3/135312485/sisikevogaxukej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427799/normal_5feff53609239.pdfIn PDF document text
    • https://rowigimafusapop.weebly.com/uploads/1/3/5/9/135982222/jawizi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368969/normal_5fe5eacbbc722.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/nowel-fotadekebo-tunewojut.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/fujadabez/tarupikitokisuporox.pdfIn PDF document text
    • http://xevivalekivo.epizy.com/ruhs_b_pharm_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/comic_book_video_template_free.pdfIn PDF document text
    • http://botemunem.epizy.com/28767031029.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/killing_chloroplasts_herbicides_targeting_photosynthesis_answers.pdfIn PDF document text
    • http://lusabugisesoj.rf.gd/vavebejasibubuvokevoje.pdfIn PDF document text
    • http://sakoperuranabij.rf.gd/57494936583.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/12961046723.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_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 5272 bytes
SHA-256: 92a0e29560700299349d76fa43faa8ff2954c67b2b24e3d9b08770ebdf08cf6d
font_01_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 11908 bytes
SHA-256: 5d8d6c21c2dc67b4429659e39f4edf220d4ce3280039af794faba56aba2e4385

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