Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa7663411303ebe…

MALICIOUS

PDF

78.8 KB Created: 2021-04-29 17:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc7a19292c6ead76fd99684ba270e5b8 SHA-1: 786e9a24b7801a53bfe5095b47168cb5e4366631 SHA-256: eaa7663411303ebe955becfbfd3e6beacfddd4eb633b2d85ba8164900e8e75ca
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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/strik?utm_term=gogroove+flexsmart+x2+instructions
    • https://gedozunirep.weebly.com/uploads/1/3/1/0/131070722/xedetunoruv.pdf
    • https://tezimapegimera.weebly.com/uploads/1/3/0/9/130968984/fedep-netoxupunip-weruvudi.pdf
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/nonuzuzokuvaxadojo.pdf
    • https://cdn-cms.f-static.net/uploads/4471514/normal_6052a7c79443b.pdf
    • http://xavelodezazil.iblogger.org/definition_of_behaviorism.pdf
    • https://static.s123-cdn-static.com/uploads/4370528/normal_5fce542f36815.pdf
    • http://busapibasin.mypressonline.com/28503225630.pdf
    • https://cdn-cms.f-static.net/uploads/4369915/normal_5fdc6c25b9675.pdf
    • https://static.s123-cdn-static.com/uploads/4503390/normal_5fed74dacf6c5.pdf
    • http://lamisorosasam.mywebcommunity.org/14829178387.pdf
    • https://cdn-cms.f-static.net/uploads/4469617/normal_603f561adc4f9.pdf
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/abee562.pdf
    • http://foxiduwanati.mygamesonline.org/46841270125.pdf
    • https://lomofatawepap.weebly.com/uploads/1/3/4/5/134599642/3363247.pdf
    • http://mafagedokopi.iblogger.org/osrs_clue_scroll_guide_reldo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_354c3c1447c647a2ab1d4965df82bf51.pdf?index=true
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_bd504ad799fb4506a0ffe98c227fe9c1.pdf?index=true
    • http://mibesajaku.epizy.com/gastric_bypass_pre_op_diet.pdf
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_42da77085d2d46bc86f7c79c45939f0d.pdf?index=true
    • http://mixezized.myartsonline.com/induced_draft_counterflow_cooling_tower.pdf
    • http://zigolura.rf.gd/stand_by_me_ben_e_king_spanish_lyrics.pdf
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_cf15d73479bc4df581c327732fc75885.pdf?index=true
    • http://nupudanotagudot.rf.gd/bach_cello_suite_1_prelude_guitar.pdf
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_ac295ee0c2564dc199c65785bb70225e.pdf?index=true
    • 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_off0000f4fc.bin
6c09607d513349db39684210a60718b9e8ab447fc47e780059206a208abbe8de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 5492 bytes
font_01_sfnt_off000107aa.bin
579ad71070f63cc069b7cd129c9a153480e2e1250ecd3c2ca1948bf82918014c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 11388 bytes

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