Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac35fe18cc4c777…

MALICIOUS

PDF

70.2 KB Created: 2021-02-07 05:21:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f8b49531658f7b0ca82e3220625f4bc7 SHA-1: a481dc29fc5a66b36fd0159ebfc1373c637c46b8 SHA-256: fac35fe18cc4c777b8e93906292f2344aa1bc761d9a24c4140bc0b56a29f24d8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains or domains with unknown reputations, suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score point towards a malicious document, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://crophysi.ru/123?utm_term=brier+creek+movies+matinee PDF link annotation
    • http://lnstagramverifycentre.com/the_docker_book1zr30.pdfIn PDF document text
    • http://kogutipabu.22web.org/12302026433.pdfIn PDF document text
    • http://center-san.ru/autobiografia_de_un_hombre_felizkzkn4.pdfIn PDF document text
    • http://onlajn-kassa.ru/721315168756p9mf.pdfIn PDF document text
    • http://1xbets-reg.site/baltimore_ravens_injury_report_week_2ys4ih.pdfIn PDF document text
    • http://pushbiz.fun/k5_learning_reading_comprehension_worksheets_third_gradeiips5.pdfIn PDF document text
    • http://julapekawej.22web.org/question_answer_of_chapter_the_ball_poem.pdfIn PDF document text
    • http://samyog.ru/zurunixepafovotakuuyeze.pdfIn PDF document text
    • http://olymptrade.buzz/textos_administrativos_ejemplosgg8lw.pdfIn PDF document text
    • http://safilow.iblogger.org/16556732882.pdfIn PDF document text
    • http://50off.pro/65543752078yv88i.pdfIn PDF document text
    • http://everydays.space/deductive_reasoning_geometry_worksheet_with_answersak6y0.pdfIn PDF document text
    • http://tryadasert.online/jizinea3eyy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/iceland_ring_road_map.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/laporan_kasus_cephalgia.pdfIn PDF document text
    • http://kojajopi.epizy.com/50606109608.pdfIn PDF document text
    • http://dekifovep.epizy.com/93399661481.pdfIn PDF document text
    • http://valebuwevunav.epizy.com/13605395339.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/wesegediduzopa.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/subclinical_hypothyroidism_guidelines.pdfIn PDF document text
    • http://vegozuw.epizy.com/xifudidiribebosarug.pdfIn PDF document text
    • http://diwevobu.rf.gd/82010287123.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 5084 bytes
SHA-256: bd530e6a86f81eacad11fb6a76e05913971296d611bf78bfeb997aeb5237d2e0
font_01_sfnt_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 10556 bytes
SHA-256: b6afe66238e10794293f04d3959187549f3a965ae44e015b2e9f3c0d3bd69fc7

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