Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c33d6d4834d35e8…

MALICIOUS

PDF

71.7 KB Created: 2020-11-18 22:09:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d7e422daf69bd5b4206ed4545167d1c3 SHA-1: e4f5e46afbb16d53a11aee35c6ce990e7193e389 SHA-256: 4c33d6d4834d35e8489e39e0d00c445c6408f37bb88727b9fe36f589f68ec8c5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. The primary function seems to be acting as a link farm, potentially for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the presence of numerous external links suggests a phishing or content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=save+the+animals+rescue+team+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492880/normal_5fb28a05be19c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_5f9e369a0164f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f8fa989353da.pdfIn PDF document text
    • https://nosekuge.weebly.com/uploads/1/3/2/7/132740467/sanelujitoxad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f888bdd2f549.pdfIn PDF document text
    • https://sazaxadapu.weebly.com/uploads/1/3/4/3/134330736/sizavi.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/3473017.pdfIn PDF document text
    • https://roresino.weebly.com/uploads/1/3/4/3/134364893/8689886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f90df4ac2bed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_5f9d0ef6bb82e.pdfIn PDF document text
    • https://kutolimog.weebly.com/uploads/1/3/4/4/134435461/4756292e6c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388157/normal_5f9a76f75a0b5.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/filavikolotojipuxom.pdfIn PDF document text
    • https://dowazulipogopu.weebly.com/uploads/1/3/4/3/134322731/9027730.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d822599-9834-4704-be68-9c099816db17/fitbit.com_setup_manual_alta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7878ea33-7384-4059-9351-5d3eb8ec4ce6/block_flawless_consulting.pdfIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 5332 bytes
SHA-256: 7c24f31a7e1ac620a803f8e39204a388dc1709fc6f20bb8330cab388a70a6e7f
font_01_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 12652 bytes
SHA-256: f173ec7702057f353a7cba18de900011c3c15ab02d514ae5dd0656a77e3361ce

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