Malicious PDF — malware analysis report

Static analysis result for SHA-256 4162be11b01da8d0…

MALICIOUS

PDF

78.2 KB Created: 2021-04-01 16:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c531cfc6518c09f7460fa361edf30e4 SHA-1: 8b5d51a9fdd717a1baf67e3a2198a752292f0275 SHA-256: 4162be11b01da8d00366a0cbea9b222c09d2d2e639dc8765337761dcbd03ccd4
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, a common tactic for distributing malicious content or conducting phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the link farm heuristic suggest the document is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/strik?utm_term=edgar+allan+poe+ghost+stories+pdf
    • https://vagapirub.weebly.com/uploads/1/3/4/6/134648019/fefuvoweritedo.pdf
    • https://cdn.sqhk.co/kedetofido/RWjb5am/42934463387.pdf
    • http://tiwimifozukimu.medianewsonline.com/mendelssohn_zum_abendsegen.pdf
    • https://cdn-cms.f-static.net/uploads/4443803/normal_6041fcc6659e8.pdf
    • https://static.s123-cdn-static.com/uploads/4444371/normal_5ffa2b0de2ab1.pdf
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/4b4edcce38558a.pdf
    • https://barijenevedi.weebly.com/uploads/1/3/1/4/131438420/acaec64e2095.pdf
    • https://static.s123-cdn-static.com/uploads/4501810/normal_5fed57ad6aeb8.pdf
    • https://cdn.sqhk.co/zepipawetopi/jdjchcg/brick_n_ball_game_for_java_download.pdf
    • https://cdn-cms.f-static.net/uploads/4458839/normal_603b4428f0835.pdf
    • https://temerineg.weebly.com/uploads/1/3/0/9/130969052/eeddc01.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_9ae80e3bb2944bdd8e296ed19f685755.pdf?index=true
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_1114e3b3c6d0406c82a373b4b6948eb5.pdf?index=true
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_11beed63ca8b4dab9eadfece4b4cff2c.pdf?index=true
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_e5225d0f485544ce9435b7af003c6f62.pdf?index=true
    • http://wenibeliso.atwebpages.com/btec_business_level_3_book_1.pdf
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_ffb19ff5b52a4a529ead4691f698c8bc.pdf?index=true
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_c84434be2e634b1ca7b766999415bb06.pdf?index=true
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_481cd9ec0f4b400e99586fea03490247.pdf?index=true
    • http://wurebosuloxu.myartsonline.com/vinop.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_off0000f3e7.bin
113e165cdc4f1552572b240f4683d5ab330fdf46a6f2b15d43187e40c0363579		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 5260 bytes
font_01_sfnt_off000105cd.bin
051a0b4cc296f513cdbcb84b118685b593c0c4966f3ed51bfe008f0c79b510f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 11364 bytes

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