Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc284f60c87bd5b…

MALICIOUS

PDF

73.9 KB Created: 2020-11-29 13:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ee7b3f55830d6eb2d35c012bad9c4fc5 SHA-1: b88cf2b52fea6e40ef4c70c3a28642ff6dd9f838 SHA-256: 0fc284f60c87bd5bfffe047ede103c1b5278d155cc4f93e06c244a02bd55d169
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

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://traffset.ru/aws?utm_term=binocular+single+vision+book+pdf PDF link annotation
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/ac32b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f9936d5ca04b.pdfIn PDF document text
    • https://lejoxenususoja.weebly.com/uploads/1/3/4/4/134497781/449aff.pdfIn PDF document text
    • https://pumewuku.weebly.com/uploads/1/3/4/6/134638235/xogawivoges.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5fa5a68679549.pdfIn PDF document text
    • https://bobixazila.weebly.com/uploads/1/3/4/5/134599816/8195021.pdfIn PDF document text
    • https://zuxobopabure.weebly.com/uploads/1/3/4/3/134344154/77c0d66326615.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/cf10476f-c536-4a96-9b77-7e0f47ab8274/xokonowasofejaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e881ee-357c-4bc7-a66e-088cd4ec8c18/zosakopogokodeguwiseseres.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb5147a-a35c-4f69-b3fb-6acc7b1ad32c/26702568956.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/2452977429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/765e1885-1760-432b-8a8e-213c424082e0/jab_naukri_milegi_to_kya_hoga_hd_video.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/ibm_cognos_tm1_the_official_guide.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 5636 bytes
SHA-256: 70d481cddeff60ddecdde9dfa69569cdf89db389b4e5587bd6a9fde5e9d92c5d
font_01_sfnt_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 11056 bytes
SHA-256: 45becad5c41d830ed70a4a36045bc772e141ef395dfa745cebb6b37952e7e363

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