Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fc8a44595f1cfc…

MALICIOUS

PDF

99.8 KB Created: 2021-02-24 08:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a865adde6197a8ecfe551dc57f4764b8 SHA-1: 585a3247974147b9cb72232b3f29c6f4eff74b2b SHA-256: a3fc8a44595f1cfcf78f9569e4b3c81e6ba5cf98d1df5cf20d3577dd0f4198be
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm, suggests an attempt to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains references to 'steam invalid ssl certificate mac', likely a lure to attract users searching for solutions to that problem. The PDF's structure and the extensive link farm point towards a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=steam+invalid+ssl+certificate+mac
    • https://jokiwaxe.weebly.com/uploads/1/3/2/7/132740814/dfd300dccf3fe9f.pdf
    • https://cdn.sqhk.co/sojowidaz/icLjcgj/facebook_marketplace_local_cars.pdf
    • http://siondez.ru/britain_for_learners_of_englishow13t.pdf
    • https://dewosuto.weebly.com/uploads/1/3/1/4/131453399/kafewagufu-mopeweloxugol-notifi-jovatagivemi.pdf
    • https://cdn.sqhk.co/resozasevej/jcjihhD/i_gladiatori_pechino_express.pdf
    • https://zikazofikadit.weebly.com/uploads/1/3/0/7/130739129/ac96db29.pdf
    • https://cdn.sqhk.co/bozawenibiwa/lQhehdL/how_to_complete_infinity_loop_level_111.pdf
    • http://gatorama.site/77051101405bvta6.pdf
    • http://maxafutolo.iblogger.org/stock_market_trading_for_beginners_uk.pdf
    • https://cdn.sqhk.co/jagejope/gdSbkih/bass_tracker_boat_speedometer.pdf
    • https://cdn.sqhk.co/kagixepo/gcLjfjg/dawn_of_steel_wiki.pdf
    • http://frukt.fun/where_can_you_buy_an_edenpure_heater3unam.pdf
    • https://limotesatax.weebly.com/uploads/1/3/1/8/131871768/9582116.pdf
    • https://cdn-cms.f-static.net/uploads/4451565/normal_5fe6f0cfaacd1.pdf
    • http://alisabor.design/lumire_sur_le_branhamismeka7k5.pdf
    • http://xatitakuv.iblogger.org/27352044488.pdf
    • http://eroganoficial.site/mixizifebowaninere8d1p0.pdf
    • https://kobuzefejara.weebly.com/uploads/1/3/1/4/131437799/didikukexufo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001353e.bin
f7a3d06b0c646f1a78e0a9f3ba76b827d69c3bd2a792382c06cf403e49b5fcf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1353E 5008 bytes
font_01_sfnt_off00014620.bin
706453c356d7b2f0d21b736d8c978c809a46f13934f0d6032d1f032f05789eda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14620 14196 bytes
font_02_sfnt_off00017372.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17372 4324 bytes

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