Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5898800658a5e8…

MALICIOUS

PDF

77.0 KB Created: 2021-02-13 06:27:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1be7254792de96cc9a9f29d386348231 SHA-1: 567ea124699d1ced7128d3ef7284fbd41e124529 SHA-256: fa5898800658a5e8e919db3a7fdadc894a4c7110ce2932a883a294ba2126c585
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and one heuristic specifically identifies it as a link farm designed for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content.

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://bologen.ru/123?utm_term=moodle+semipresencial+2014 PDF link annotation
    • http://businesslinecenter.com/89489463897ezgcx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_5fe616162a65c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5fd9865c47ca9.pdfIn PDF document text
    • http://pipvip.ru/cool_ppt_presentation_templatesil350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_60256abb50d69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454672/normal_5fce2841c704f.pdfIn PDF document text
    • http://clientbluebadge.com/oregon_wine_mapua0qy.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/jiS8Vgj/78771867057.pdfIn PDF document text
    • http://natiral.space/damubakexuwekukafodobukhq5h7.pdfIn PDF document text
    • http://svoytrylend.xyz/shark_attack_videoswvk0r.pdfIn PDF document text
    • http://instasurprise.online/glo-_bus_simulation_quiz_1_answers28syb.pdfIn PDF document text
    • http://pedrons.space/touch_me_not_apryl_baker9s4u2.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/jbZz0mc/life_is_strange_games_in_order.pdfIn PDF document text
    • http://lavkavkusa.store/viwepuna59fgf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fomabobas.epizy.com/nonetusowinonamakinake.pdfIn PDF document text
    • http://wuzuruwevirelu.rf.gd/buckeye_cable_basic_channel_guide.pdfIn PDF document text
    • http://kuwubunaxube.rf.gd/business_plan_template_examples.pdfIn PDF document text
    • http://kuwoguki.epizy.com/zajosevusubulediwukapak.pdfIn PDF document text
    • http://robogotut.epizy.com/denemederusexadegix.pdfIn PDF document text
    • http://mojofukiw.epizy.com/99852090887.pdfIn PDF document text
    • http://guzaxugevogifu.epizy.com/95548371964.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_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 5640 bytes
SHA-256: 1bfcb5cb068c56d373e350a6fda45bfdbd1ce1bdbb9bdaa1c4864998a34b19d0
font_01_sfnt_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 11436 bytes
SHA-256: 06bbeef14b4c9cf900cffae1eae422f73b3bc1022e91c06e502db6114f62fe72

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