Malicious PDF — malware analysis report

Static analysis result for SHA-256 177893df4c308099…

MALICIOUS

PDF

88.4 KB Created: 2021-05-26 05:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e74d7a58361023c741d7e0274ebf0552 SHA-1: 38398022c73a9e5726535cbab7d1bf2229ab28f9 SHA-256: 177893df4c3080992ac81c197a1dbadef03b8e14267fee183982a67908bc06b0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=list+of+reflexive+verbs+in+spanish+for+daily+routine
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/rawezexawoxure_lobosaluzeti.pdf
    • https://mapunexi.weebly.com/uploads/1/3/3/9/133999872/xaputimawopafidamuri.pdf
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5fd646e9ac455.pdf
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5fe6126225603.pdf
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/lotidone.pdf
    • https://cdn-cms.f-static.net/uploads/4413458/normal_602d774c3fc27.pdf
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/94a8a0e7263.pdf
    • https://cdn-cms.f-static.net/uploads/4414164/normal_605bc1c44e222.pdf
    • https://silodadut.weebly.com/uploads/1/3/2/7/132712229/nomavovozojobixor.pdf
    • https://cdn-cms.f-static.net/uploads/4371267/normal_606508abdefcb.pdf
    • https://gibitomenufe.weebly.com/uploads/1/3/4/0/134041720/tozazazavez.pdf
    • https://cdn-cms.f-static.net/uploads/4465398/normal_6038139fe391f.pdf
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fdfb78737e2e.pdf
    • https://ziruxirunilexa.weebly.com/uploads/1/3/0/7/130775543/190548.pdf
    • https://static.s123-cdn-static.com/uploads/4477167/normal_6008b7f28edd7.pdf
    • https://puzaloraren.weebly.com/uploads/1/3/4/5/134510283/4938157.pdf
    • https://static.s123-cdn-static.com/uploads/4484815/normal_60013e7b5ee1a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gonima/32759019937.pdf
    • https://uploads.strikinglycdn.com/files/05259e15-29c4-4141-a30e-8b56eea49b87/2884228919.pdf
    • https://s3.amazonaws.com/dixaleko/83053588194.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/tg_1800cos_945-sin_495.pdf
    • https://uploads.strikinglycdn.com/files/d24302cf-bd44-454d-9f9d-57dfbbe0f17b/troy-bilt_zero_turn_mower_drive_belt_replacement.pdf
    • https://uploads.strikinglycdn.com/files/f7ae4d68-2429-4095-843f-760eb7d11811/81459932939.pdf
    • https://s3.amazonaws.com/nasitevu/sawiwofijevepu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001175d.bin
3b571088960697c7676505613261a3098628bbdd3cc1eb0e789d1b18daf260a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 5440 bytes
font_01_sfnt_off000129df.bin
71b68c88c4ff02e2365286265ea59004ae02d7b692e6d2c56b09ad7dca5c9929
pdf-font-stream PDF embedded font (sfnt) at offset 0x129DF 12084 bytes