Malicious PDF — malware analysis report

Static analysis result for SHA-256 daff55df5d81e8b5…

MALICIOUS

PDF

71.2 KB Created: 2021-03-19 04:30:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 50a33a2efefcdcd10f97d7c4c8a6ac38 SHA-1: a643557aea1cf497b1d2be81ddb5040d57f302fb SHA-256: daff55df5d81e8b561734202d2161ab18aa6733ee924fe426ffc453edbe2f95f
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs and the PDF structure indicate an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=impressora+hp+photosmart+c4280+manual PDF link annotation
    • https://fejoburu.weebly.com/uploads/1/3/0/8/130813906/6415887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_600cc5bc03ed1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_603a98853f49f.pdfIn PDF document text
    • https://kapelivoxiri.weebly.com/uploads/1/3/4/0/134040857/dogopaxejeneta-bajopegolokalu-nalaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405190/normal_5fe7ce1f83e22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384160/normal_6006733519ddc.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/556338.pdfIn PDF document text
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/mofosapaladu-rodujezudowo-janugogesa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393624/normal_5fcdaebbdb588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_603041e860e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5fd31e2069a6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451752/normal_5fc87095ad9a8.pdfIn PDF document text
    • https://wonozonozosog.weebly.com/uploads/1/3/1/3/131398184/jakipire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_603e37d842314.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kinifojuno.epizy.com/datuzogiguwenutoripidewe.pdfIn PDF document text
    • http://geboxopok.rf.gd/kasibenodezipazawamumi.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/busuu_arabic_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738a483d-3fe5-41aa-97b3-4c47328384e5/zerovibipiwexidununewu.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/lurituzakugutejetanefi.pdfIn PDF document text
    • http://modewomidoxiva.epizy.com/76684986149.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/in_apa_format_are_articles_italicized.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dee83ce5-1493-4e6b-b4bd-81c431f9a725/the_raven_edgar_allan_poe_symbolism_meaning.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC471 5500 bytes
SHA-256: 3083c53eeb3671587e1bcc553b55ac4adbc53842645567f39e0bea08bf1e32d9
font_01_sfnt_off0000d6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 12600 bytes
SHA-256: 0ea45f47af49f50b949c618f1721c7e08dfb590b4fa940862c7da16010dfc9d3
font_02_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3