Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbc82a1d16800e1…

MALICIOUS

PDF

69.4 KB Created: 2020-11-16 22:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e1d6adf8576d4cc3904e9c60704fa950 SHA-1: 1f2dfedb260660ab104fff06ebec6f14d0bc8535 SHA-256: 0fbc82a1d16800e1ddea4083f826907b82d1066a61cc5e0ca0f6b9c02358b298
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm and redirector pointing to malicious infrastructure, specifically 'traffmen.ru'. This suggests the document is designed to redirect users to phishing or malware sites. The presence of numerous external PDF links further indicates a link farm strategy, likely to obscure the final malicious destination. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffmen.ru/strik?utm_term=narnia+2+in+hindi In PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/4946338.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/c8a358dd5c9b.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/lidagegunumilek-pofawuwufadi-munipasilufe-rituwimid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_5f99242dd101f.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/bededuxotulapil/79528679570.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/the_rock_cycle_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/19516484581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e05b7c-1ebc-4c78-a166-bfcc93067e90/lezofugenugubatefu.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/kuwoxejedenawijenowexow.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/fonow.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/jifefena.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_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 4804 bytes
SHA-256: af01e94917a77dbb5d0809c57dbd81a36d9cdd8bc06d4fb7fd01dbf08794f81e
font_01_sfnt_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 11364 bytes
SHA-256: 87e5a51d866beff8c6d79b9bc8741652758374f4317301b5a9f66e93d6116c0f

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