Malicious PDF — malware analysis report

Static analysis result for SHA-256 466afb47f3179b0d…

MALICIOUS

PDF

72.7 KB Created: 2021-01-15 14:59:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c48f6e4d3b10bf14df3d4835c4999065 SHA-1: bbffe5bc3f1636416440e09ddf45b86930b1cd7d SHA-256: 466afb47f3179b0d969a4be1545c229d86db34832b012fa54adf84a63594cef8
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://trafficel.ru/123?utm_term=avg+definitions+manual+update', likely serve as lures to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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=avg+definitions+manual+update PDF link annotation
    • https://site-1174172.mozfiles.com/files/1174172/In PDF document text
    • https://site-1193467.mozfiles.com/files/1193467/58911238234.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376379/normal_5fe1008c9b4d0.pdfIn PDF document text
    • https://site-1204796.mozfiles.com/files/1204796/diaphyseal_medical_term.pdfIn PDF document text
    • https://noguvipeves.weebly.com/uploads/1/3/4/7/134717425/mipufano_kodevimisenov_tinizezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_5fd3bad6ed977.pdfIn PDF document text
    • https://site-1171720.mozfiles.com/files/1171720/remix_omg_dolls_song.pdfIn PDF document text
    • https://lejoxenususoja.weebly.com/uploads/1/3/4/4/134497781/8c255b4313.pdfIn PDF document text
    • https://site-1168079.mozfiles.com/files/1168079/detention_netflix_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5f9ea9d5839b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_5fa9dd38ab80f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_5fea3612ce82b.pdfIn PDF document text
    • https://site-1176708.mozfiles.com/files/1176708/64521457766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_5f8e3d1a3cb77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378857/normal_5fe6ccc07c78a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 5312 bytes
SHA-256: 91efb09143d2a26f0dbbe6a350a94ca0b2c300cf4fd3a7dc00248dfbde84d54d
font_01_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 11192 bytes
SHA-256: d9bc6f0cd7cf5ff8747d15852cc3f423e998d0c39bf6c3e7711d636950748f0d

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