Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb107a90be8182b…

MALICIOUS

PDF

103.0 KB Created: 2020-11-29 09:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ccb92fe8933054158915b93b51a0591 SHA-1: 9eb73c02cf81ee92d1ee64fdb44dd352e93b8c24 SHA-256: adb107a90be8182badf9f120ed1d2eb470abed1e84fa2a98d3109d55d1e69fc1
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malicious content delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://trafffi.ru/123?utm_term=aztec+letters+tattoos
    • https://cdn-cms.f-static.net/uploads/4416514/normal_5f9c3011e1918.pdf
    • https://sefuzogesosemo.weebly.com/uploads/1/3/4/5/134579576/xifevikerifew-roganenemiw-jisemud.pdf
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/loxoraxovikaruxir.pdf
    • https://cdn-cms.f-static.net/uploads/4426944/normal_5fc33a2e9600c.pdf
    • https://cdn-cms.f-static.net/uploads/4475730/normal_5fa8fb3033f52.pdf
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f9c7ee7e60b5.pdf
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f87069020095.pdf
    • https://cdn-cms.f-static.net/uploads/4426551/normal_5fa3534679112.pdf
    • https://cdn-cms.f-static.net/uploads/4444869/normal_5fa7e5d3d7916.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zazelujeju/kawusewo.pdf
    • https://s3.amazonaws.com/sisaxu/gededoxaruzo.pdf
    • https://uploads.strikinglycdn.com/files/d50c854f-a03b-4a70-ac29-d44ea53f6ca9/pampered_chef_egg_sandwich_cooker_recipes.pdf
    • https://s3.amazonaws.com/rebomedug/farosipetugosakibamuwow.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_off00014f20.bin
c0a40715c3e5d2e6b5a0ea577bb2ca7f55002fe3746ab8ea1b7275b68fccc5c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F20 4468 bytes
font_01_sfnt_off00015e57.bin
63a04cd95b04b14f37d8d3c49c2a2617cb3b7684a43aa40f8b59e20ac8776c11
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E57 10396 bytes
font_02_sfnt_off00018142.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x18142 4324 bytes