Malicious PDF — malware analysis report

Static analysis result for SHA-256 a270066abc9d53a8…

MALICIOUS

PDF

86.1 KB Created: 2021-01-27 16:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7a5856a0e7d2bdc61112c3f3b9d88bf0 SHA-1: 7264d3b788605a38f857933ae1ec5df782da6e68 SHA-256: a270066abc9d53a8fe756f773b06d99df8d96df9c008d43e3f48b93be614381d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, contains strings related to domains and URLs, reinforcing the link farm attack pattern.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=light+domain+gods+5e In PDF document text
    • https://cdn.sqhk.co/togodawexu/jbieFOt/beatles_song_quiz_buzzfeed.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/xiitiiG/24648023656.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/bhphgPY/khloe_kardashian_age_25.pdfIn PDF document text
    • https://futuratolofuzup.weebly.com/uploads/1/3/5/3/135399438/dusoxokebibitapote.pdfIn PDF document text
    • http://nutapobo.iblogger.org/hoa_architectural_review_form.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/9aWRoPX/blitz_brigade_online_fps_guns.pdfIn PDF document text
    • https://cdn.sqhk.co/duzupafuj/Gewfxja/zifelogixopor.pdfIn PDF document text
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/sutazebadapek_guworadosixa.pdfIn PDF document text
    • https://ribelogexarov.weebly.com/uploads/1/3/4/5/134500322/3694187.pdfIn PDF document text
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/6087379.pdfIn PDF document text
    • https://buginibonimej.weebly.com/uploads/1/3/2/7/132711973/fce2ecdd264a.pdfIn PDF document text
    • https://cdn.sqhk.co/jaguwubax/0YhwKyS/madorugojejiwetogogim.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/jdjjgio/new_york_times_today_s_paper_opinion.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/higjggu/oculus_vr_games_coming_soon.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/8PAI2gf/chicken_of_the_sea_in_spanish.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/libowebujakux/aromatic_hydrocarbons_nomenclature.pdfIn PDF document text
    • http://kizuwopo.epizy.com/92219524584.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/answers_to_capsim_situation_analysis.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_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 4964 bytes
SHA-256: 4ff5a8a864b577325b5b54abf060e42da8a036153dc02a7d20231f50c5c3eaf6
font_01_sfnt_off00011a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2B 10456 bytes
SHA-256: f2ccdc5d09f75efb34db2998a915cf74e1d30da2b897c617d4f455f30b41dd03
font_02_sfnt_off00013db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333