Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd5d93d8af00753…

MALICIOUS

PDF

83.1 KB Created: 2021-05-19 22:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f5b78e6fe145923a1722d39ebe6a0f3 SHA-1: e141a6605dd4388fc0079096b599fa3ff2aa6997 SHA-256: 0fd5d93d8af00753bdf97ff1949e8d1931f059f2c9a3a5e1d4d192f1f98769d1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as search results for educational materials. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file. No scripts were extracted, but the presence of numerous external links suggests a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://ponafet.ru/strik?utm_term=mht+cet+2015+question+paper+with+solution+pdf+download
    • https://cdn-cms.f-static.net/uploads/4403816/normal_6037bf1916ccf.pdf
    • https://sufosuzupunu.weebly.com/uploads/1/3/1/3/131379650/zijudepogesok_rexenagipen_zoginijobe_dezanotirubomeb.pdf
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/jinumedobumiv.pdf
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5fd64bcb5d34f.pdf
    • https://pazolumaf.weebly.com/uploads/1/3/4/3/134356568/jitapixuxa-varaxa.pdf
    • https://static.s123-cdn-static.com/uploads/4403820/normal_5feb5f29eaa91.pdf
    • https://cdn-cms.f-static.net/uploads/4367631/normal_606cdccbc6fff.pdf
    • https://cdn-cms.f-static.net/uploads/4465024/normal_604ddc291c971.pdf
    • https://cdn-cms.f-static.net/uploads/4421966/normal_5fda4b4b922bc.pdf
    • https://cdn-cms.f-static.net/uploads/4427544/normal_606b503e52ba2.pdf
    • https://labaveboto.weebly.com/uploads/1/3/4/6/134611097/gikesebaxar-sabegofiju-mijolawizore-foxofolewiza.pdf
    • https://cdn-cms.f-static.net/uploads/4474222/normal_60222b4458b8d.pdf
    • https://cdn-cms.f-static.net/uploads/4389394/normal_60390d5504ba7.pdf
    • https://juvedolukojubis.weebly.com/uploads/1/3/2/6/132682904/womavamuwakejafi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/b2fd4596-da3d-4c08-a923-c9a5273efa69/landice_treadmill_safety_key_replacement.pdf
    • https://uploads.strikinglycdn.com/files/2e3855dc-b22b-4be9-92c3-386a3620aa51/stihl_fs_56_rc_wont_start.pdf
    • https://s3.amazonaws.com/gazijewevan/33201877357.pdf
    • https://uploads.strikinglycdn.com/files/eacc6565-a07f-4711-b2b5-612c2c10fd51/noughts_and_crosses_novel_summary.pdf
    • https://uploads.strikinglycdn.com/files/9649198d-b981-4c77-9a72-ac4cf69c7d0f/39677797693.pdf
    • https://uploads.strikinglycdn.com/files/5bab73be-2669-4353-bb08-454fea1062b0/cuanto_son_100_gr_de_mantequilla_en_cucharadas.pdf
    • https://uploads.strikinglycdn.com/files/801bfccf-7e3c-4564-bdae-9202a525bcc1/wudovidu.pdf
    • https://uploads.strikinglycdn.com/files/45d27e62-c8fa-423e-aee5-cc3b5344d4a5/printable_bunco_score_sheets.pdf
    • https://s3.amazonaws.com/nerugiraxura/wakelozapedagowede.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6fb.bin
40d357ea45896294554d7339cbaf6358ad01774e01a82049731e4ecfbcb1a57f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 5916 bytes
font_01_sfnt_off00010b46.bin
e43c20c052a48824f31898c0203c916d80b29422a2543c98712cafad1b15ff35
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 10772 bytes
font_02_sfnt_off00012fc6.bin
36587f8a3ed9c194a2327d904e192f3bb49ca9b952979ba816008cea1092c9f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC6 3224 bytes