Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f3c5cb0b5d2ecc…

MALICIOUS

PDF

68.1 KB Created: 2021-04-24 13:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 62e3fa68925415f45360aecabf52171f SHA-1: 77ce7356431624f06915ba96991d09904d8cadc1 SHA-256: c0f3c5cb0b5d2eccda926e52810d506998b015ba42a323eb3122a68f4a618e3f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the document's metadata indicating it's a financial manual further support a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://soxebez.ru/strik?utm_term=financial+managerial+accounting+for+mbas+5th+edition+solutions+manual PDF link annotation
    • http://rijunoje.mygamesonline.org/razas_de_bovinos_bos_taurus.pdfIn PDF document text
    • http://pikejofopon.mypressonline.com/63281307544.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/alcatel_one_touch_pop_star_5070d_firmware.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/davusikipaluxizab.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_12be88f4bd464f1791dd9264e08c4b4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/89379708197.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_ab89019f75f54cc59b05edeea92d479d.pdf?index=trueIn PDF document text
    • http://gozidonozali.myartsonline.com/what_causes_commotio_cordis.pdfIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_f01c4b5fa0ca43b0bc53fda5cbe2d59a.pdf?index=trueIn PDF document text
    • http://tamupevex.rf.gd/titus_andronicus_movie_watch.pdfIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_a38de4177cc542d39b805741444fe0ef.pdf?index=trueIn PDF document text
    • http://dojorunubi.myartsonline.com/job_interview_in_english_questions_and_answers.pdfIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_b78275829eed4f5a8dcd412127441573.pdf?index=trueIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_ce1d841007464bc98a9b2ff90ef58f4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiduro/samsung_t24c550nd_power_cord.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_fe91c80ed4774ed0a7762b0b67b9009b.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_d4e14c843afc44fcb5836e5ab029aa81.pdf?index=trueIn PDF document text
    • http://faxumev.epizy.com/bu_admission_circular_2020_20.pdfIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_cf0466c17e1d4a718cf2ee466b23495f.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_917cd0dfef204eae9379a5480fd61b89.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_29e4b3732778440a8cb98165518a66da.pdf?index=trueIn 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_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 5656 bytes
SHA-256: b9f757598f30cc1e09c952b546e10614616851ba7bdcca01b77b3e3c47648f16
font_01_sfnt_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 10356 bytes
SHA-256: c81a7941f87a6c351b262807d6acf20880cf60bc6e8dbfc9f39eea3861612cf9