Malicious PDF — malware analysis report

Static analysis result for SHA-256 f491193567d7a8d9…

MALICIOUS

PDF

76.5 KB Created: 2021-02-20 10:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bde69d506d4882fae8ad7b7438cb62f3 SHA-1: 490b125dc9f0c80e5d1a56e08c2bc693dd7ee0a4 SHA-256: f491193567d7a8d962d2abd156c13985f9abbcb3035712d0c492ca71eb294e59
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing campaigns. One prominent URL, https://jacksth.ru/strik?utm_term=microlife+blood+pressure+monitor+instructions, is directly linked to the document's apparent content, suggesting a lure. The presence of ClamAV and ML heuristic firings, along with the PDF_SEO_LINK_FARM detection, strongly indicates malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=microlife+blood+pressure+monitor+instructions
    • https://ziwuwozapa.weebly.com/uploads/1/3/4/5/134517717/9869716.pdf
    • http://kavosizob.iblogger.org/sobadilibekezekoduxuti.pdf
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/dudusurose_lasewi_saketezik_vabuv.pdf
    • https://cdn-cms.f-static.net/uploads/4369911/normal_602d65f7c5ef3.pdf
    • https://static.s123-cdn-static.com/uploads/4410216/normal_5feb9c43cc57d.pdf
    • https://static.s123-cdn-static.com/uploads/4475382/normal_5ff0f26cbfc7d.pdf
    • https://cdn-cms.f-static.net/uploads/4476152/normal_602cb0d6e5ff1.pdf
    • https://xalitive.weebly.com/uploads/1/3/4/3/134320973/358c3c5ce15.pdf
    • http://nesapumedavemag.iblogger.org/new_hd_bollywood_movies_2018_free.pdf
    • https://cdn-cms.f-static.net/uploads/4479433/normal_6018688875819.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/najubu/70182532762.pdf
    • https://s3.amazonaws.com/fujadabez/aadhaar_using_mobile_number.pdf
    • https://s3.amazonaws.com/jeworurowam/black_diamond_songs_2019.pdf
    • https://s3.amazonaws.com/vavapekadoliti/ek_chumma_song_2019.pdf
    • https://s3.amazonaws.com/kotodur/pokib.pdf
    • https://s3.amazonaws.com/tigewibejageju/momazubisarib.pdf
    • https://s3.amazonaws.com/lupuvogotog/ampere_apk_full_pro.pdf
    • https://s3.amazonaws.com/bokofapig/tricky_maths_puzzles_with_answers_in_tamil.pdf
    • http://suvoxezol.rf.gd/chrome_extension_ublock.pdf
    • http://xenuduximowub.epizy.com/inquisitor_greyfax_rules.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed27.bin
2b2b06517bb76fd57ba418bb2c47b840185982cc9e3b30c553322390be4e3b7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 5236 bytes
font_01_sfnt_off0000feea.bin
bca18591f49fc113429f47b828aac713a7aaa39ea9fb64e28302704566a07872		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 10988 bytes

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