Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5f0bc05bbed779…

MALICIOUS

PDF

75.1 KB Created: 2021-02-24 03:39:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4a90382625e43e2ed3b1596f830ddc36 SHA-1: a16de9a77bbdadb713dca79c4b68c638384788e0 SHA-256: cc5f0bc05bbed7796be71095bc9b2d8e7c2a252bb22266b254b9d8bf8f15d4bc
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary links, http://cabinetshub.xyz/fakuwebosemetesavifirewilczgkq.pdf, is flagged as a random URL, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection further support the malicious nature of this document, likely serving as a lure for phishing or malware delivery.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://maypoin.ru/123?utm_term=does+google+have+a+marketplace PDF link annotation
    • http://shimano-stradic.ru/pocket_watch_chain_goldxx0bb.pdfIn PDF document text
    • http://songkfrk.site/43100025257rm5db.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/bjeicgg/12336272915.pdfIn PDF document text
    • http://heliusdesign.ru/3975239517zwm0c.pdfIn PDF document text
    • http://cabinetshub.xyz/fakuwebosemetesavifirewilczgkq.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/7jbiPjd/royal_splendor_mattress.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/CZheggh/koan_cary_reviews.pdfIn PDF document text
    • http://opit.space/zigojegepovovurejono3tj9s.pdfIn PDF document text
    • http://adv-workshop.site/fenozurowrnjch.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/bWvyjjW/68007946810.pdfIn PDF document text
    • https://sajipetifejej.weebly.com/uploads/1/3/4/8/134883768/vexojukoxoruja-walap-wukunun-xafonizikumug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fofeguj/zomazojen.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/jakabezeriwuzanobugedomu.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/brochure_design_software_free_full.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/savelitagapasogabezidigak.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_off0000dba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA6 5104 bytes
SHA-256: 6fa6731f3388e33d37eb281f0c1ad6af85e8367a42d2910686ad793d82ba7d95
font_01_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 10696 bytes
SHA-256: 702665c46e35b33c0df3a29af53f1c5003be0feeef29b9ad9c0b51987d4d42ad
font_02_sfnt_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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