Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9a92ff88662403…

MALICIOUS

PDF

83.6 KB Created: 2021-03-14 05:19:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ac520aff3d469f4ab84c002bb53eb610 SHA-1: fe68119902b75f656acdc4fbfabc94d780ffcef7 SHA-256: 7d9a92ff88662403fc009e848c72bbfff48f79a2fa8ddb1146a1b4bd9a306b50
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body is heavily obfuscated and appears to contain junk data, but the presence of numerous external URIs points towards a malicious intent, likely to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=how+many+pages+in+each+twilight+book PDF link annotation
    • https://pawudovavumub.weebly.com/uploads/1/3/1/4/131411600/bojak_lotaxoles.pdfIn PDF document text
    • https://tiletemilowa.weebly.com/uploads/1/3/2/7/132710791/3754552.pdfIn PDF document text
    • https://cdn.sqhk.co/notudubugu/igZRjOr/reading_comprehension_worksheets_for_6th_grade_students.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/5hdzjei/jawidusufadadabemamomos.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/djejfNK/61717840496.pdfIn PDF document text
    • https://cdn.sqhk.co/zotenejek/eCOt1Ik/ode_to_heroes.pdfIn PDF document text
    • http://knitfqph.site/69131574576hoyco.pdfIn PDF document text
    • https://zetitazafoxiz.weebly.com/uploads/1/3/4/0/134040412/4430458.pdfIn PDF document text
    • https://cdn.sqhk.co/fifusaji/QFAghmX/goals_barcelona_betis.pdfIn PDF document text
    • https://cdn.sqhk.co/mezadisedud/Khjogha/58769113047.pdfIn PDF document text
    • http://autoport76.online/wuzekelelidoxixeduwix8z5j7.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/v0jfggS/snapped_off_synonym.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/vhhPBgi/timunuwenolu.pdfIn PDF document text
    • http://uscreditreport.info/5034721043580dx7.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/iZgg0ii/hokey_pokey_uk_version.pdfIn PDF document text
    • https://cdn.sqhk.co/rewanizotaj/iaWibH8/easy_diy_halloween_costumes_teenage_girl.pdfIn PDF document text
    • https://dimejozetef.weebly.com/uploads/1/3/1/0/131070151/temexovevebox.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/igfghib/ledawibewejegazosoziteraf.pdfIn PDF document text
    • http://hs-life.ru/hair_solutions_shampoo47zou.pdfIn PDF document text
    • https://cdn.sqhk.co/fexivijemozu/YojdjbQ/roligaliporolawaredati.pdfIn PDF document text
    • https://zopiwaseka.weebly.com/uploads/1/3/0/9/130969839/vozazebe.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/cNjhcyw/vijipegezawobo.pdfIn PDF document text
    • http://decideyouself.fun/shooting_kabul_summaryuru2s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_b8a53689f9f444e3a0d4047f81ce3183.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_07492b9e36c2489d986b906ca7fdcb31.pdf?index=trueIn PDF document text
    • https://8dc488cc-5c17-4bbd-bfcc-4d65d6cbc3db.filesusr.com/ugd/10b03a_17e498cd95244ba8b90ab62b1d1ca0d1.pdf?index=trueIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_0b82ed06c59945de9ee9f6d231b685f4.pdf?index=trueIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_7584ef32b5934f83b2ab0d68d12b6c06.pdf?index=trueIn 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_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 5612 bytes
SHA-256: 68229d5788d9eab2887b090e0a600599097822aee136f6bc6175951119f3261e
font_01_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 11560 bytes
SHA-256: 007001b3bdbf418bdd7d9f75edefbdd321a84232c7def0a77e93c6122445f989