Malicious PDF — malware analysis report

Static analysis result for SHA-256 a431a5771917a9d3…

MALICIOUS

PDF

64.8 KB Created: 2021-02-18 19:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7a6b96c92f1b24bf5a2ae05213f2fcc1 SHA-1: d3a0a2cb03f49f67ce0f25ac32c2ce8a2ebc8718 SHA-256: a431a5771917a9d38ccaec0c09660ef8bece03ac33b20f1c6813acf1a8dab640
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using small PDFs on disposable hosting with UTM parameters, common in phishing campaigns. While no scripts were explicitly extracted, the presence of external links and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/aws?utm_term=how+much+is+a+used+model+3 PDF link annotation
    • https://koponabunabo.weebly.com/uploads/1/3/4/5/134520941/2589034.pdfIn PDF document text
    • http://runojiponavu.22web.org/boxibedajefolilizosowo.pdfIn PDF document text
    • https://cdn.sqhk.co/bejamisokepu/eicijwG/hop_step_jump_2_movie.pdfIn PDF document text
    • http://tesocoin.online/805911678276yewg.pdfIn PDF document text
    • http://wejnpowk.space/gadgil_report_summary_in_malayalamsif91.pdfIn PDF document text
    • https://fuvejewitopi.weebly.com/uploads/1/3/1/0/131070508/2258255.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/uib3jdx/782104407.pdfIn PDF document text
    • http://pumutug.iblogger.org/bismark_bs-_16i_apk_android.pdfIn PDF document text
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/9592579.pdfIn PDF document text
    • http://investmag.org/wawenegakuzif65mz.pdfIn PDF document text
    • http://copyright-security-ig.com/35245824686c4q6j.pdfIn PDF document text
    • http://aicberg.net/41986086833ni69a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fefomuk.epizy.com/59756027992.pdfIn PDF document text
    • http://jipidabaxepej.epizy.com/adobe_premiere_video_transition_effects.pdfIn PDF document text
    • http://pareruwawetis.rf.gd/blackstone_fortress_escalation_kill_team.pdfIn PDF document text
    • http://mesitineka.rf.gd/everybody_hurts_piano_sheet_music_free.pdfIn PDF document text
    • http://zepedijuva.epizy.com/controlled_writing_and_guided_writing.pdfIn PDF document text
    • http://misosemarimo.rf.gd/answers_to_aaa_defensive_driving_course.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_off0000c341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC341 5300 bytes
SHA-256: 65aed3829342f77e4b241ca40d56ec191e2046d693421599cadcb402bdd57b51
font_01_sfnt_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 9736 bytes
SHA-256: 6135d12d3955b075e6d6a8fef30e43949a19d3bbad6515b1aed021678b7b0d75

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