Malicious PDF — malware analysis report

Static analysis result for SHA-256 405fe55a009e729d…

MALICIOUS

PDF

141.9 KB Created: 2020-11-22 04:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ddbfd9ac87785d0b174944fdd354d2cb SHA-1: b79f99ad384dc793e2fae42bd57484d40c2183fc SHA-256: 405fe55a009e729d88daa0578c8dd80026c5eab44d4c97ca10d18f3306ba1b2e
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links pointing to external PDFs hosted on various disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a potential phishing or malware distribution vector. The ClamAV detection and ML classifier further support the malicious nature of this file.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=camp+fire+cal+fire+report In PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/manelol.pdfIn PDF document text
    • https://loxuvamozevu.weebly.com/uploads/1/3/4/3/134310095/bde14.pdfIn PDF document text
    • https://sufimaxunexex.weebly.com/uploads/1/3/4/3/134345405/ad2ec66bb2850.pdfIn PDF document text
    • https://meritogaxubov.weebly.com/uploads/1/3/4/7/134767100/fufimalaj_pazezezag_bivagakoki_mepur.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/61dc0.pdfIn PDF document text
    • https://wubugivaruj.weebly.com/uploads/1/3/4/6/134669137/tuwebegimuj_seleni.pdfIn PDF document text
    • https://xirofepomare.weebly.com/uploads/1/3/0/8/130814083/vitug-nixunadatasula.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/gabemomigipenaguv.pdfIn PDF document text
    • https://zapirugitoz.weebly.com/uploads/1/3/4/5/134508168/3477624.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/xiluwagudowuxo.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/vezumobigodub/arqueologia_en_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/magiduwuxeluf.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/gajusefalosigani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70858889-64c4-4a62-bc9b-409a85e4d2e8/14057632198.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_off0001f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F047 4888 bytes
SHA-256: 63dd8adbf6cd78f19af0caf859d027539ff2b6caba771f3f5d3859e1d006d0fc
font_01_sfnt_off000200d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200D2 12272 bytes
SHA-256: bd1ca2e3ca12c6d53bde5c52aef8965d2d3cee895bd4005e697eb71f7bf42803

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