Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffce1b46379161c9…

MALICIOUS

PDF

74.6 KB Created: 2021-05-02 03:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bfa93572818a4d7964f03367e39d38d8 SHA-1: 2647f7d96a77b3c787008469aa0533462bd24df2 SHA-256: ffce1b46379161c93d2e285896fafbe66b60efc4ccba34b73394814a11d7d6ca
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 redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though partially garbled, suggests a lure related to repair costs, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/strik?utm_term=cost+to+repair+chimney+crown PDF link annotation
    • https://wotudopis.weebly.com/uploads/1/3/4/6/134679731/wobigeg_bevivafobez.pdfIn PDF document text
    • https://simokatojerosu.weebly.com/uploads/1/3/0/8/130874490/3113011.pdfIn PDF document text
    • http://sosuwede.iblogger.org/gesomemiwaseweviwuzesuzo.pdfIn PDF document text
    • https://mugakosi.weebly.com/uploads/1/3/1/3/131379948/mijiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_60693926e5f64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_602b886c4e783.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/54927084909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475582/normal_6034d448ca76f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476757/normal_603661e1bef61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370528/normal_5fe41ffa2155e.pdfIn PDF document text
    • http://pawusewi.sportsontheweb.net/dd_3.5_rules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_6065b2e33b4e9.pdfIn PDF document text
    • https://zowukudikumo.weebly.com/uploads/1/3/1/3/131382828/sebetadawaroli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_5fe6f85bc9472.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5fed9f4644080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475874/normal_5fe32d8de8a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_603ccc4b6643f.pdfIn PDF document text
    • https://bokesaxigalul.weebly.com/uploads/1/3/0/7/130776824/nivejulage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_60406dc7756dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445866/normal_5fcce5537a580.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bilisedutave.myartsonline.com/aristoteles_metafisica_libro_2.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/50643451726.pdfIn PDF document text
    • http://gefilodeza.myartsonline.com/kalnirnay_calendar_2020_marathi_free_download.pdfIn PDF document text
    • http://sojisij.epizy.com/marcus_aurelius_philosophy.pdfIn PDF document text
    • http://vuzelupuz.rf.gd/best_free_online_acoustic_guitar_lessons_for_beginners.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 5240 bytes
SHA-256: 3ed2a7ef77ad552f13ac1deb9a26b483bc60b29a9ff3f5f3e2e912e12f3039ab
font_01_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 11028 bytes
SHA-256: 3def1787cef6a87c995494eb52a63ac39082cccfd40a39b3aa1ebf39675de2e4