Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9259ee712e5046…

MALICIOUS

PDF

73.9 KB Created: 2021-01-08 14:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8c0cf8cd85e3deca3f76ed37e91aefa5 SHA-1: 6f8b5ebdd6b6f7fb8b82e0153b1b593e931cae39 SHA-256: cd9259ee712e504638adfd68a7869052d788bcbcd48fa2ff5131a643bf3e9fa5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?utm_term=car+racing+2018+mod+apk+android+1 PDF link annotation
    • https://cdn.sqhk.co/difanemifal/gg1jgZj/motafejufifajoje.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxesotovo/iajahf3/tozikud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_5f9412eda4d25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458635/normal_5ff1ddc19d608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_5fbcadcb06637.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/hjeUqjL/19577447137.pdfIn PDF document text
    • https://kosigejobawazi.weebly.com/uploads/1/3/4/3/134315380/ferekigavesel.pdfIn PDF document text
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/mudilopuzepijakubob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f9b23bb65268.pdfIn PDF document text
    • https://cdn.sqhk.co/tavimuxeju/geggehe/mine_blast_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_5fa63b4a698be.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/5add9c5e-b89d-4f17-9122-33e531f23ad9/plainville_high_school_ma.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/83726941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3631411f-b1f2-4eff-b7a4-8e585dba3b74/tsunami_warning_in_washington_state.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_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 5672 bytes
SHA-256: 38885eeb75a78c69b30fc0a616a928ac7b792ddbc3446f1489e0d0c5d83d9cf3
font_01_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 11052 bytes
SHA-256: 7d9341a0722c13a7235659554f532e75ddeab1dd252a9c79903a607877610850

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