Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f96770156a43f0…

MALICIOUS

PDF

98.5 KB Created: 2021-03-11 13:13:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1025e68f1c4625227466d579d56a2459 SHA-1: a6ab87d2402214885ba1d958d9161c12ee4aee01 SHA-256: 18f96770156a43f0bb615262649a1c819fea7ad10594fe5887a72427abcf5be3
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to drive traffic or potentially phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/award?keyword=bsa+hiking+merit+badge+pdf PDF link annotation
    • https://cdn.sqhk.co/pubisifibuj/1ijxsGK/mini_td_classic_tower_defense_games_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/zodunoxurob/jcShgjg/furreal_friends_gogo_my_walkin_pup_uk.pdfIn PDF document text
    • https://pabarubuvu.weebly.com/uploads/1/3/1/3/131379718/08021b5.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/chhidQY/wisipavafebapa.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/zCDhhUK/7506156169.pdfIn PDF document text
    • https://lurugidapu.weebly.com/uploads/1/3/4/3/134315770/bobixonibe.pdfIn PDF document text
    • https://talovilivakalod.weebly.com/uploads/1/3/5/3/135326419/lokumaditam-durog-rutukepojit-verejexexaw.pdfIn PDF document text
    • https://cdn.sqhk.co/disidudi/iUjigfs/dopebufiperuwelodo.pdfIn PDF document text
    • http://rapejavom.22web.org/90381717076.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/2085ca38-b8ae-4885-86e5-729545dd9da4/aprender_ingles_basico_para_nios.pdfIn PDF document text
    • http://fumojaj.epizy.com/lavokozoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b25aeb-fc5f-41d1-964f-35c071545062/how_many_calories_in_a_sonic_cheeseburger_with_mustard.pdfIn PDF document text
    • http://govujetimavex.epizy.com/88087275841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3eeb79-d225-4f98-a6a3-695d6bd1d60a/43922840152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/020eaaeb-5330-4415-84b5-c98fd144da67/10088112784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e4c842-9238-42f7-bf85-176452e0aed9/para_que_sirve_el_te_de_manzanilla_miel_y_jengibre.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_741c11542fd944b1a7b180a313f1566a.pdf?index=trueIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_3121001654f1438189014f648724d83d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7241be0-293b-41eb-b442-4fe537c193ae/zorojuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61de40d1-daa8-44e5-ab51-1c5fff88bf2e/susogaxukinawogijawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07be9ee6-3b20-4425-8ab3-fb55c73c1ade/bupawixadabov.pdfIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_499fb4d2626240ca8419ea54f8d91c60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/188abd74-5dad-4441-854c-50bc4ef08b1f/85213333914.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14358 5676 bytes
SHA-256: ca110620a29f8bdd96038bc39f71a98db21b5440660d242ceb03a021fb1809bc
font_01_sfnt_off0001567a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567A 10784 bytes
SHA-256: 50869cdab11584545cc62026909e7cb45f39764b051ad55f3ec8219080721f30