Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f10ff22f0c79907…

MALICIOUS

PDF

74.7 KB Created: 2021-04-02 06:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e65033afc8059986d8414799eb441a6c SHA-1: 18832b95721cc660c88a07ae08cea061c72c232d SHA-256: 2f10ff22f0c79907c1fe55194c011b9978d8ec7fb0cef2ec54ea4979c28b8d8a
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 for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=everstart+750+jump+starter+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386839/normal_605c689f57044.pdfIn PDF document text
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/bopisimeti-fesorepuban-fatimujojamisif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_604ce5f858f1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486061/normal_5fc742ccc7788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_6047abfcefe7c.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/jemesajolumapepewor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_5fe7c808d1ab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407085/normal_601319a551f92.pdfIn PDF document text
    • https://lufojujerap.weebly.com/uploads/1/3/4/4/134481619/2c9d3e101fb4876.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408995/normal_5fe55ae61c683.pdfIn PDF document text
    • http://vamefegali.mywebcommunity.org/95276990136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529977/normal_603a0f02cee75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_60442ee0e759e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_8c6c34a34b3f4cb0a165c0418fa9e8ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulozor/tekaxexadabilenawu.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/crying_baby_hd_images_free.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/15206307431.pdfIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_a7492470e3a546d4ae4ee4ed69e3dae7.pdf?index=trueIn PDF document text
    • http://jimarol.myartsonline.com/wijapogonotado.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/34368668544.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_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 5404 bytes
SHA-256: 2f49928d44c9021f2601f75980dd668babb43c17c9f442f6818ea11cdd4441ba
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 10844 bytes
SHA-256: e37f9cb00ad4c7523aa7043707abfc4d11afbba7aefc2746de580fa5bc888681

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