Malicious PDF — malware analysis report

Static analysis result for SHA-256 b545bee43ace57a9…

MALICIOUS

PDF

89.9 KB Created: 2021-06-05 19:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 22127fa669f86cfa244423c1e24f10d2 SHA-1: 75d9cb548c6e5bf481da3d1d875655a45fca9ca3 SHA-256: b545bee43ace57a9d6ee7fa16c7bd44313177b3dd4fe0ca92b7657ff82819ea5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a malicious intent to redirect users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the link farm and the presence of external URIs strongly indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=aditya+narayan+songs+free PDF link annotation
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/2325003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_5fdb1ce85c602.pdfIn PDF document text
    • https://setojeduvesile.weebly.com/uploads/1/3/4/5/134587971/jerupijida-ninanunogugi-bideguponimoko-fufonuzerazekav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378831/normal_601467938a7ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475203/normal_5fe1829c19f5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472208/normal_604dd552c554f.pdfIn PDF document text
    • https://raxuzorufureraw.weebly.com/uploads/1/3/0/7/130775378/betozaxiviguraxi.pdfIn PDF document text
    • https://jevemiparo.weebly.com/uploads/1/3/4/5/134501543/dofis_kanax.pdfIn PDF document text
    • https://bikafosujikus.weebly.com/uploads/1/3/2/8/132815014/rafesu-babidilomugob-duvapizizikafe-pijugidesev.pdfIn PDF document text
    • https://sivaxibekexisu.weebly.com/uploads/1/3/4/4/134488572/f8763781b201eb4.pdfIn PDF document text
    • https://mikotefi.weebly.com/uploads/1/3/2/6/132695671/lebiwogufezesa.pdfIn PDF document text
    • https://janazasifopuno.weebly.com/uploads/1/3/4/4/134437996/damutixaf.pdfIn PDF document text
    • https://nasotatuji.weebly.com/uploads/1/3/4/3/134392375/bdec3398e8.pdfIn PDF document text
    • https://tizosofamininu.weebly.com/uploads/1/3/4/3/134352685/temonepexotode-buvime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_60519f64c2e6e.pdfIn PDF document text
    • https://sipebiwamedewor.weebly.com/uploads/1/3/4/7/134707389/3155784.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385197/normal_5ff69683aa271.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/34696568a87fe1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/22e5b52d-7df3-4f26-82b1-4715b9871662/rozudifofapumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd937f3-1f12-4cb3-8264-bf484a17ca44/suzini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a365af6a-9085-4968-aa16-6533ca267002/hp_deskjet_ink_advantage_2545_printer_driver_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09c9b27-60cf-4b62-8bce-d5b9dcd6542a/xejelediketefopagesuzat.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_off0001247f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247F 5132 bytes
SHA-256: 213abb39b9a460ed823039368d73a69e32ffe695e99865ef5c01b8928406562c
font_01_sfnt_off00013612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13612 10704 bytes
SHA-256: fb49d45f5282cf61b9586e9b388509f2694134a48a991bb2a6f3f07607560993