Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcb134857137592…

MALICIOUS

PDF

73.3 KB Created: 2020-11-29 20:26:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ef0c986fa7f6ee4b1bcf42b673886056 SHA-1: 43773c0577352d8e2c286a30b4d81fc6c6db1e37 SHA-256: ffcb1348571375927026cd16e2e01b5ba9686091370697ceee97b88c1af941ea
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffi.ru/123?utm_term=d3+monk+leveling+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5f9323db12f53.pdfIn PDF document text
    • https://tikepewovexa.weebly.com/uploads/1/3/4/3/134317170/cf06cdf038156f.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/e7d30aa632701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_5fad70d15db89.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/kotosatodemusotewe.pdfIn PDF document text
    • https://nekegofoka.weebly.com/uploads/1/3/4/3/134364724/c816bf74549.pdfIn PDF document text
    • https://faluwizux.weebly.com/uploads/1/3/4/3/134372305/49ded69c76f04b2.pdfIn PDF document text
    • https://kagepejipewabo.weebly.com/uploads/1/3/4/8/134871264/ac5b8dd2e.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/48872dcc-afee-4c9f-899a-476098674043/wardlaw_academy_tuition_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0daebba-7c7b-4e7a-a313-ed2e6a067c45/35390862428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e69d3b09-295a-40a2-bd1d-49bbbeaca2b6/kavar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d395a402-42b7-47dc-94ca-3f794717e785/pusipusuvarapuwajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22be1c6-ce1f-4002-ab06-e32a4eca202b/hiyokoi_where_to_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4e5798-9e4d-4fda-8180-1bb3a7d21faf/loos_ornament_and_crime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a076942-0e27-4555-acbf-b03f7eb74c02/tomirusuliduwuku.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 4948 bytes
SHA-256: e969e002c50b93d49fb15580b7ee48877097b2bad96f016d9a97b484bbeb96cb
font_01_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 10916 bytes
SHA-256: 2bf35d69da9e6fdb487eee147d0d40c1821131771294e9ea38d4ae5b88397e26

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