Malicious PDF — malware analysis report

Static analysis result for SHA-256 a165ce7269136f91…

MALICIOUS

PDF

78.9 KB Created: 2021-04-01 10:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d269d26dd95653b7323c564084890839 SHA-1: 5f41d305a0176e70a38b1e197f357b71468f7165 SHA-256: a165ce7269136f91f0a6f0a0dbe58f67e1e0a31d4088335702b87b742d0d3f81
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numeric slugs pointing to PDF files, a technique often used for SEO manipulation and distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL points to a suspicious domain, likely serving as a landing page or distribution point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=jumpsuit+dress+for+wedding+guest
    • http://loxokunetuladi.66ghz.com/harry_potter_y_la_orden_del_fenix_libro.pdf
    • https://cdn-cms.f-static.net/uploads/4449771/normal_5fd892ccc3017.pdf
    • https://cdn-cms.f-static.net/uploads/4427274/normal_6035c0eb3e433.pdf
    • https://static.s123-cdn-static.com/uploads/4420237/normal_5fe4e9362b578.pdf
    • https://static.s123-cdn-static.com/uploads/4446379/normal_5ff45aab73125.pdf
    • https://cdn-cms.f-static.net/uploads/4466161/normal_6045122b349d7.pdf
    • https://static.s123-cdn-static.com/uploads/4421787/normal_6002bb1883765.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/piradi/83555219398.pdf
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_aa2586aa171942ceb2ffa5ef8ed12f02.pdf?index=true
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_3ed0acf0bc824ead95f0616c933b0eab.pdf?index=true
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_264cf5b0507046db8e8b040bf5ee838c.pdf?index=true
    • https://s3.amazonaws.com/vebisop/43130872761.pdf
    • https://s3.amazonaws.com/tokatefozude/puvev.pdf
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_44de0be357234d379de83d9c9ce16b2f.pdf?index=true
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_1c18d6e9973c4b8189561b7aa7ca860e.pdf?index=true
    • http://lagadasisipas.rf.gd/16328062153.pdf
    • http://mekepeputidiji.epizy.com/polymerase_chain_reaction_types.pdf
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_45341ce4540e41f8855a70c7875a3bd5.pdf?index=true
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_9bd1be8e171e4589b77d585c27624887.pdf?index=true
    • https://s3.amazonaws.com/telasebisu/kamegonorimetudaderivanon.pdf
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_c5fd0df1063d4f079e2e4b9dbe5896c9.pdf?index=true
    • 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_off0000f70b.bin
53a0c870289e21b011aaaa19e4f0e4edcd999847f18acc52ae786b9f1a6a0a9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 5200 bytes
font_01_sfnt_off000108bb.bin
0c584095b151116c979eb1fc1fed63ee6321a2f5d2d38eeecc25eec3ecf36fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108BB 10944 bytes

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