Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a342c7875a4caf…

MALICIOUS

PDF

79.0 KB Created: 2021-05-28 00:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3e2c74701780496e0546eccf7ea6510f SHA-1: dac6ab4615063d4af1fa1e6032fe6d743acbc1c2 SHA-256: b0a342c7875a4caf91f556aa7c1c1de7c2be37749fbc3350ea6413c3398c58de
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and extensive link farm point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/strik?utm_term=how+to+change+the+airtel+dth+base+pack PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423696/normal_605c0bc39182f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471509/normal_604d35d2186e9.pdfIn PDF document text
    • https://sofugiri.weebly.com/uploads/1/3/4/5/134509821/78001.pdfIn PDF document text
    • https://virerulifig.weebly.com/uploads/1/3/1/4/131407283/tediji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482023/normal_5fe6fc8a882a7.pdfIn PDF document text
    • https://xutogimumunode.weebly.com/uploads/1/3/4/3/134375265/rifexuf_tebade_finebukutewuta_rifebujerujel.pdfIn PDF document text
    • https://kinijanara.weebly.com/uploads/1/3/4/5/134585029/farinineboto_serixize_kipigifugaxani.pdfIn PDF document text
    • https://lepuxodotedob.weebly.com/uploads/1/3/4/5/134507089/rubetewefilumib.pdfIn PDF document text
    • https://xupemapimosow.weebly.com/uploads/1/3/0/7/130776757/goginu_voxitunefanopa_fulitumujalaf_pomegezubinek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_6055f851b0f90.pdfIn PDF document text
    • https://kekebamifibem.weebly.com/uploads/1/3/1/6/131606854/kemam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_605d7b1075a6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_602a3ff2d7c54.pdfIn PDF document text
    • https://nefarixuk.weebly.com/uploads/1/3/1/4/131407944/6239043.pdfIn PDF document text
    • https://nefalitarula.weebly.com/uploads/1/3/4/3/134308949/c400f9.pdfIn PDF document text
    • https://gixorinimomavam.weebly.com/uploads/1/3/2/6/132695995/9d9a4b425d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_600e70afa5828.pdfIn PDF document text
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/kusabu-koder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488090/normal_606e2a5ed1234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_6061525bc404c.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/dovoruruwime_duwajemam.pdfIn PDF document text
    • https://mekufaro.weebly.com/uploads/1/3/5/2/135294947/8314254.pdfIn PDF document text
    • https://kaxejawajafu.weebly.com/uploads/1/3/4/7/134776484/niludaneperig-punofunujitete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 5592 bytes
SHA-256: 560d1b1863a2e18a942cb07691025f05dd2d6848564b6f943db75a3f93e23a08
font_01_sfnt_off00010644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 11356 bytes
SHA-256: 75adbe1db368e6d3caa9265386e39e95bd5799c5d80d8fb14ae5d24ce1b080db