Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1af451a50fc69a…

MALICIOUS

PDF

76.8 KB Created: 2021-04-11 08:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30e7802cfa70767923bc9529674b4e82 SHA-1: 5fdb657e5c9ec3e088873da77cfc3113efa4981b SHA-256: 6e1af451a50fc69ad2615f42e4f9d36bb0bdc105d583afb5e7aaffcd6452f295
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs, likely for SEO manipulation or to redirect users to phishing sites. The presence of multiple external links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-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://zajinet.ru/strik?utm_term=libro+de+fisica+1+serway+pdf
    • http://baby-slings.ru/how_to_know_when_to_buy_a_penny_stockopvrt.pdf
    • https://static.s123-cdn-static.com/uploads/4449185/normal_5fc9e7dd351b5.pdf
    • http://gikubozudunol.iblogger.org/mosopulejokuzazidubosilim.pdf
    • http://help-copyrighteamservice.com/kolenukaxulo3mzgv.pdf
    • http://olymp-trade.top/how_to_get_minecraft_houses_on_amazonf0z9i.pdf
    • http://help-bluebadgecenter.com/coleman_6250_generator_partsg9cfa.pdf
    • https://static.s123-cdn-static.com/uploads/4451348/normal_5feebf9971f10.pdf
    • http://busevabafumoje.iblogger.org/697548241.pdf
    • https://cdn-cms.f-static.net/uploads/4489428/normal_6036de0651676.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_4e356f858ea948e887d7e6e586069cdd.pdf?index=true
    • https://s3.amazonaws.com/winumigutam/canon_430ex_ii_not_flashing.pdf
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_08b1f44eb3544bffba99ee9bf225a372.pdf?index=true
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_ab3b392ead7e44488e31b18b5cbf64ef.pdf?index=true
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_1b6d1fc0d62a409b9bbb31488526e31e.pdf?index=true
    • http://tuvojiteziw.epizy.com/logical_reasoning_ability_test_questions_and_answers.pdf
    • https://s3.amazonaws.com/lovetijif/xibevonawarapajuki.pdf
    • https://s3.amazonaws.com/mojivikapeti/dojupujojomaripe.pdf
    • http://fulovefodib.epizy.com/83892324161.pdf
    • http://mikugux.rf.gd/4580154376.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_b2a174a0d9434f0ab5aed2c661bb17fe.pdf?index=true
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_c8dcdb0d1d30460185a8bcceef23eddb.pdf?index=true
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_0318834c36a64e6ca89969fe24be3dbd.pdf?index=true
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_5059920244a043d4ab7189515d11b035.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d799.bin
d7adbcc5afc4a2c7294294346a813bc65e5d4593d27c0fd2e1d52525dce90a70
pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 5444 bytes
font_01_sfnt_off0000ea4b.bin
78673fa4c369a0d49d749beab8ebbc04860377b58d9dc878f7e991b1c2c3999b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 11744 bytes
font_02_sfnt_off00011155.bin
5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 16140 bytes