Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8468792ae92334…

MALICIOUS

PDF

90.7 KB Created: 2021-03-16 11:28:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c3c8460cb70a4d3d8a1474394d4f115d SHA-1: 075aba30705e49917b96b6041e7fed8a8bf1e891 SHA-256: da8468792ae92334afec252dbb2a6525c75ebead6cce152fb7d252b5531fad46
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and redirects to a link farm, suggesting an attempt to distribute further malicious content or phish for information. The document body, though heavily obfuscated, contains keywords related to 'gaming pc storage upgrade' and the wkhtmltopdf application, indicating a potential lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://pelibifir.ru/wix?keyword=gaming+pc+storage+upgrade PDF link annotation
    • http://nuwikivetajed.iblogger.org/dusijusinevejufiwugex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_60419a1095b0e.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/ks7ijji/quick_dessert_recipes_with_biscuits.pdfIn PDF document text
    • https://cdn.sqhk.co/marezotije/ejgiaPZ/60699636508.pdfIn PDF document text
    • http://boost-store.net/shudder_definition_noun91vhn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_60180d72906b5.pdfIn PDF document text
    • https://xilinupuvawede.weebly.com/uploads/1/3/5/3/135350476/natewatakugoxad-rabixosuresen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496378/normal_6005246f36992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465907/normal_603f674779c56.pdfIn PDF document text
    • http://tinuliv.22web.org/xemaxebafojigedanim.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/fikane_sanakuxapuj_wopalola_dizulemojero.pdfIn PDF document text
    • http://rerolakareruxom.22web.org/bulking_diet_meal_plan_female.pdfIn PDF document text
    • https://cdn.sqhk.co/zajujinul/Fgi7jd2/fezakasof.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/jcPibha/nda_exam_syllabus_2021.pdfIn PDF document text
    • http://antonioit.fun/77606152850yl33c.pdfIn PDF document text
    • https://cdn.sqhk.co/pidefatop/NKgjhg5/laratixuwuzojowezanikonog.pdfIn PDF document text
    • http://vorecan.fun/survey_organic_cosmeticsi4k5m.pdfIn PDF document text
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/731164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484635/normal_5fd7cc2cdf9f3.pdfIn PDF document text
    • http://pressit.space/satuxubuvotomowkap0.pdfIn PDF document text
    • http://gaydating.world/botowalo68dh9.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/dinisemowoge/61113282863.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/72996172321.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/zevexujugow.pdfIn PDF document text
    • http://wojalurume.epizy.com/46678622182.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/google_sheets_shortcuts_insert_row.pdfIn PDF document text
    • http://zamoguwudegovo.rf.gd/69830488638.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/disco_elysium_beginners_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 5272 bytes
SHA-256: 366520287716450b7bb15cfd5a2583a2a941a001c4c7a88c93c52024d5d5e82c
font_01_sfnt_off0001293b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 11016 bytes
SHA-256: 4587e9a46543aa52b9482dc9769007d45b1ff3dbc6c6775ee18f7f2e8e19ee4d
font_02_sfnt_off00014eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34