Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77e9f613c80adb1…

MALICIOUS

PDF

73.9 KB Created: 2020-12-07 04:08:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18d732b50a72d173d2dcfb69801c0437 SHA-1: 1c9695304aafe6ff81b934a476723e0af3227f86 SHA-256: f77e9f613c80adb12f9290ac0e2b5361e28f5575ad62fcc0d9671cbd98766164
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of encrypting payloads to bypass initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffe.ru/strik?utm_term=the+hadal+zone+oceanography
    • https://nobokoxevukaj.weebly.com/uploads/1/3/4/7/134755509/surazukiwoj.pdf
    • https://cdn-cms.f-static.net/uploads/4425511/normal_5fa061e229ab5.pdf
    • https://cdn-cms.f-static.net/uploads/4392444/normal_5fbe98aa36bc7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ccd0e42c-5104-46be-a60f-d3df6911fade/vavojoluka.pdf
    • https://uploads.strikinglycdn.com/files/24d2e2d2-76cd-4a43-9de9-6bb39f966015/30866391315.pdf
    • https://s3.amazonaws.com/guxosa/15556973514.pdf
    • https://s3.amazonaws.com/zodawanuror/95722659285.pdf
    • https://uploads.strikinglycdn.com/files/c1277ff3-45e7-4e1f-bed8-1e93cbd2aa2d/78397255806.pdf
    • https://s3.amazonaws.com/gitipelut/learn_french_for_beginners_free.pdf
    • https://uploads.strikinglycdn.com/files/3e5321b8-f608-492b-a18c-21df38b73a09/11958913304.pdf
    • https://s3.amazonaws.com/rozebofukixus/photo_cartoon_editor_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d798.bin
ee6c615a4703e3c30c324e119693141b8f581e45d28c0d4e41bf75f4aded19e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 4920 bytes
font_01_sfnt_off0000e846.bin
fbc41d488fd3b0c30551bc8d3ad8c102d73df467fc6a14458d454873a43628e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 10776 bytes
font_02_sfnt_off00010cc9.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 4324 bytes

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