Malicious PDF — malware analysis report

Static analysis result for SHA-256 472a23214822b798…

MALICIOUS

PDF

72.9 KB Created: 2021-04-28 20:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a83dacc85592afc02a6e125ee8d0ce9e SHA-1: b9bcb1807fd217c13e08a4cdac2385b179fc082d SHA-256: 472a23214822b798d5ad2b0d8799055ad2eed93e6bbd64e2189070f08a0bade7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The primary malicious URL, https://resalured.ru/strik?utm_term=louise+l+hay+books+in+hindi+pdf+free+download, suggests a phishing or malware distribution lure disguised as a search result for free books.

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 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://resalured.ru/strik?utm_term=louise+l+hay+books+in+hindi+pdf+free+download
    • http://pewadulojuba.mypressonline.com/58534008212.pdf
    • http://donbetosstreettacos.com/jotaputav9ktqh.pdf
    • https://static.s123-cdn-static.com/uploads/4484169/normal_5fcf419f6668c.pdf
    • https://cdn-cms.f-static.net/uploads/4387417/normal_6054502d5fd5f.pdf
    • http://benilobodereji.mygamesonline.org/hot_work_permit_form.pdf
    • http://neip-forum.fun/847143535683ikac.pdf
    • https://cdn-cms.f-static.net/uploads/4486984/normal_5fd909a205ff0.pdf
    • http://discovljzg.fun/pujitafuxejs482.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_8a569dec832d43a7a8524fd0469fc496.pdf?index=true
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_842afebe35cb47cba3d57aef709dc9d8.pdf?index=true
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_3fe828ff1cfe4e7493699d9ca00cf09d.pdf?index=true
    • https://s3.amazonaws.com/kujapomib/puvenibup.pdf
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_675b53f3472749cca4bafaef4791ac50.pdf?index=true
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_6c2497f0f63a405fac0e40970e756404.pdf?index=true
    • https://s3.amazonaws.com/salosibejodod/lesavonigelibefinakabujos.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_off0000dd97.bin
c164f0f0db75a227d54ffb9628b687b2a89adc1a34121f6cefefe50aec9d76ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 5468 bytes
font_01_sfnt_off0000f03f.bin
0da832c516b4630f540cfad6f434d0c5aa1356f2849003070bf1c422cafbf214
pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 10700 bytes