Malicious PDF — malware analysis report

Static analysis result for SHA-256 48032c68c052aeab…

MALICIOUS

PDF

67.7 KB Created: 2020-11-25 12:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac7dcf7a0115c61906d856988b52af0c SHA-1: d4595727730870eca1d57a9f60ced8426645c5ff SHA-256: 48032c68c052aeabcc949d237d77bef7d35b7adeb3995f8112caf42b98bcdad1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the PDF structure are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/123?utm_term=mr.+coffee+12-cup+programmable+coffee+maker+black
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/metor.pdf
    • https://rogubadivuna.weebly.com/uploads/1/3/4/3/134337887/zubetotese.pdf
    • https://cdn-cms.f-static.net/uploads/4379032/normal_5f8f969c9a014.pdf
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/7455520.pdf
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5f9d169788f27.pdf
    • https://gesovomovo.weebly.com/uploads/1/3/4/7/134716395/386681.pdf
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/c5c5141.pdf
    • https://mofivekirupu.weebly.com/uploads/1/3/2/7/132740685/4719383.pdf
    • https://tikepewovexa.weebly.com/uploads/1/3/4/3/134317170/8148983.pdf
    • https://tovisasuwuvep.weebly.com/uploads/1/3/4/5/134513775/6566556.pdf
    • https://ledijomunekivi.weebly.com/uploads/1/3/4/5/134584754/e14920acb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sobaketemu/27673040181.pdf
    • https://uploads.strikinglycdn.com/files/13dc3456-f0a9-4217-8ee1-623d925d4328/kingdom_come_deliverance_best_light.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_off0000ca37.bin
a81ec2a49ba1f5bc3e13191503744c3c1e23cf748f9eab2aa653744b415dbd25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA37 5616 bytes
font_01_sfnt_off0000dd68.bin
77e2a1f1996f31e56a617892a1eea3f058b9390508b55e9d306f5cea588d23d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 10484 bytes

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