Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2c8cd2a8060279…

MALICIOUS

PDF

78.4 KB Created: 2021-05-15 05:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2635cc416c2b1a76c309cd1d1db538eb SHA-1: ecadf7ec7f9cf60a15693d584da7f87b48c450de SHA-256: da2c8cd2a8060279bad26c04180ffbabcb1e0d5f29b123f19fb2a806ddca1a01
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'lozipotod.ru/strik'. This URL, combined with the heuristic 'PDF_SEO_LINK_FARM' indicating a large number of external links, suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://lozipotod.ru/strik?utm_term=english+grammar+practice+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493200/normal_60461fbe0c50d.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/2w0DuGj/phoenix_arizona_weather_january_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/xinoxoxojib/gs3oaii/tabletop_simulator_key_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_6069fc72d80bc.pdfIn PDF document text
    • https://pobapuzelikawe.weebly.com/uploads/1/3/0/7/130739661/4851436.pdfIn PDF document text
    • https://cdn.sqhk.co/futidiwe/jjc7iap/white_triple_s_sneakers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_5fd3210ee3792.pdfIn PDF document text
    • https://zugufirit.weebly.com/uploads/1/3/1/1/131163535/fekosi_weruvawa_xadabosuri.pdfIn PDF document text
    • http://xetutut.iblogger.org/neet_zoology_syllabus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nudizelaf.rf.gd/onkyo_tx_nr809_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef43873-f52a-44aa-a1f1-dabe3ee2d463/61251369706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd58e7b-8ca4-4f2a-bfcd-f64f16fc82bd/zigumirifefaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee28c940-ff72-4aab-a9cd-2db3551758f5/is_cbs_going_off_the_air.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf31f15-e349-45f6-8a69-18da4206d218/dead_doctors_dont_lie_podcast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a8893d-366d-42be-bbaa-9f55337b2b8f/como_mejorar_la_educacion_a_distancia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84ca0c1-1c18-4d12-984a-8fcad748106f/puzakawazobimakogozor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84974f28-d563-4c2c-a367-6b625f4a2984/47936841155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b25e49-fd2a-4ceb-b71b-c65ecef42da9/69670541011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e8dd9c-683a-4ee8-9e63-71f8898fc1d0/89888716429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67303574-3943-4891-ba5e-c32de11479b1/crossfit_workout_routine_advanced.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 5304 bytes
SHA-256: fb5722934657ca08a4a39379b922f33dca6b78a4085481a3b24c336747e30bbf
font_01_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 11396 bytes
SHA-256: 2214111055f2cae9579edb2200de811bf82f33967ea2961dd42501c7716a7cae

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