Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec704c6bbf58bf7…

MALICIOUS

PDF

67.1 KB Created: 2020-12-28 10:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1cc186f686db5aea20f78e19c2f7b4ed SHA-1: e4d4efe827030a30ded37f5f3e741c8921ce67f0 SHA-256: fec704c6bbf58bf70174f20b1b9d7f597aecf64c9b29a867c46856e737ba7c01
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, indicating a potential link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, possibly for SEO manipulation or to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/strik?utm_term=banana+a+banana+runt PDF link annotation
    • https://cdn.sqhk.co/kapidibewomu/bhdzhic/construction_assistant_project_manager_jobs_houston.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/8761533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495399/normal_5fb28fa0491c1.pdfIn PDF document text
    • https://bugalesatu.weebly.com/uploads/1/3/4/3/134309104/561709.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/6iejihe/pabezugijakuzot.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/0005d5d5.pdfIn PDF document text
    • https://savakorudefipe.weebly.com/uploads/1/3/2/3/132303238/solefoleselovufibu.pdfIn PDF document text
    • https://cdn.sqhk.co/juputufom/jghhiaF/sofuginirobugudunogodavox.pdfIn PDF document text
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/sikagivuv.pdfIn PDF document text
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/0dc71cd73.pdfIn PDF document text
    • https://cdn.sqhk.co/xawuboma/5jdsfgf/xabiviledanisexozofo.pdfIn PDF document text
    • https://lomivurusizova.weebly.com/uploads/1/3/4/8/134868764/xotuxagixen_jifetejed.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/ifKjagc/microsoft_e-_learning-_applications_office_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/vthhiWz/kezirekilopinezojuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/fadato.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/charlie_brown_christmas_piano_book.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_off0000c845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC845 4656 bytes
SHA-256: 027fb5e56418d48d4ad585f1b1fef2e48ba93dbe2297c08312c00181c313b9ea
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 11600 bytes
SHA-256: 6c2b0419c3b03dd5fc4b3541c824debebf1349920f6afa8a025efa73ce5c8b28

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