Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ab1451d32bf9b8…

MALICIOUS

PDF

67.5 KB Created: 2020-12-24 02:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 08cb73faf98b6b302bd195799d6737a2 SHA-1: f62137b0b95b6cab5ed7e02fc67d78f7f1a3ae17 SHA-256: 42ab1451d32bf9b8c399b4e2dc5e3502d9445b6e332b9a7b806f24caeba95bc4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of the specific lure.

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://trafftec.ru/strik?utm_term=dialga+shiny+pokemon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499317/normal_5fb52a67576ac.pdfIn PDF document text
    • https://bexulijariva.weebly.com/uploads/1/3/4/8/134885506/43a5815d01af0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486036/normal_5fe3c2e3081f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413238/normal_5f976e0e09f46.pdfIn PDF document text
    • https://kaxamibixifuwiv.weebly.com/uploads/1/3/1/4/131452941/a330d527352e7.pdfIn PDF document text
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/e4e8f2492551.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/2c15d131a8605.pdfIn PDF document text
    • https://nafeziwubiwodi.weebly.com/uploads/1/3/1/3/131379183/669776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_5f9b6bdb42eea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413468/normal_5fac373626cfa.pdfIn PDF document text
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/woxirixiz_gikavomunaleril_fivinixonazaki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480595/normal_5fe2e7b579ea6.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/8276477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481695/normal_5fb9ca609820a.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/konew_dipubaz_morumeverefur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC919 5300 bytes
SHA-256: b3b877c0e43395dd5f6a21a9262ed020c10b754b0f39185ec86104c289bb4dd1
font_01_sfnt_off0000db12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 10900 bytes
SHA-256: 05b50aaf90d85a193d3e3c562eedc94b836adc78f90695984efecb2eacd8ed1c

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