Malicious PDF — malware analysis report

Static analysis result for SHA-256 caca571e39e6488d…

MALICIOUS

PDF

100.0 KB Created: 2020-11-22 21:34:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b104f01895aae8d4628675d85de8c9b SHA-1: d69e9d6e16b09c251181b4326c88975b260c5c82 SHA-256: caca571e39e6488dc815d0b26cc113383ff8b5e275aeb476f953f8d2155978b7
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or phish users. ClamAV detection and ML classification further support its malicious nature. No scripts were extracted, but the PDF structure itself indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=concentration+check+pathfinder+2e
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/7558161.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/retisovojor/poxuledogokuxa.pdf
    • https://s3.amazonaws.com/ligole/tezow.pdf
    • https://s3.amazonaws.com/pibabopuduj/damavipa.pdf
    • https://uploads.strikinglycdn.com/files/8cf197f6-ee52-4bfd-afea-2249ac7b50e9/lakazinaw.pdf
    • https://s3.amazonaws.com/zaxuledo/58739295154.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/46112279748.pdf
    • https://uploads.strikinglycdn.com/files/93bded57-9fd5-4cbc-8fc3-d208ad573574/norme_ute_c18-510.pdf
    • https://s3.amazonaws.com/nonipesikiri/rotowire_mlb_injury_report.pdf
    • https://s3.amazonaws.com/lejivugeleguwod/25837577986.pdf
    • https://s3.amazonaws.com/jenisozazewubo/nutilat.pdf
    • https://uploads.strikinglycdn.com/files/fecb5e00-99fe-46f6-bf1c-e122362626c3/13567071731.pdf
    • https://uploads.strikinglycdn.com/files/1905173a-bf33-451b-9067-fe07318e9aee/middle_earth_shadow_of_mordor_achievement_guide_and_roadmap.pdf
    • https://uploads.strikinglycdn.com/files/0100e8e3-f7f8-4958-93d7-3a8b3c8031c3/28045975037.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a82.bin
28e57604ce0155c19370c824a91df42fd9e8fb9f55fe62d2c88c5e203dc9e65d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A82 5136 bytes
font_01_sfnt_off00015bf7.bin
603d40e78d4599b5d622ffb307d5d5ce3eed8dccd39599ddfde046a6cc2a0fe1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF7 12136 bytes