Malicious PDF — malware analysis report

Static analysis result for SHA-256 80de66e662f0a1cd…

MALICIOUS

PDF

137.7 KB Created: 2021-03-18 18:33:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 27b9a5e70b93ce441a9650af010924a7 SHA-1: 14976fc6a57b5777ca729270926aab20ad42c5cf SHA-256: 80de66e662f0a1cdc2b93e7476542d9d9f626c6ae5bc0cb1d13a7196eeb059d5
214 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'dafemum.ru'. The document body, though heavily obfuscated, contains text related to 'Chiefs schedule 2020 pdf', suggesting a lure. The presence of numerous embedded links, many pointing to benign PDFs, indicates a link farm strategy, likely to improve search engine ranking for malicious content or to host further malicious payloads.

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
  • 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.
  • 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://dafemum.ru/award?keyword=chiefs+schedule+2020+pdf In PDF document text
    • https://xesusufekab.weebly.com/uploads/1/3/4/8/134864027/tovabozejow.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/26957485781.pdfIn PDF document text
    • https://vukibipodut.weebly.com/uploads/1/3/4/6/134690361/nuxetunutike_wijulod_jipidedaw.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/dadasib.pdfIn PDF document text
    • http://poxinezov.iblogger.org/62078788265.pdfIn PDF document text
    • http://xujukega.66ghz.com/jevotezuri.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/6adbb1.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/cellule_de_sertoli.pdfIn PDF document text
    • https://xupugafowepeg.weebly.com/uploads/1/3/0/8/130814457/f7c949c3d3.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/dazemi/kedusi.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_e867c7c1527347039e737a438fbe5c89.pdf?index=trueIn PDF document text
    • http://peledopa.myartsonline.com/42366058388.pdfIn PDF document text
    • http://vodesoxiside.rf.gd/assassin_s_creed_origins_pc_poor_performance.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_38cd47b3f39b4883993781b485c82f33.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/8th_grade_math_benchmark_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/rugolobupud.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/72081174834.pdfIn PDF document text
    • http://zuraravata.epizy.com/ariston_washer_dryer_combo_armf125_manual.pdfIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_56ea354d181f449f911a6dd1d9cf1bd3.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_a4fa8dca388b447d8917723053f2d3b2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedimuta/62272401515.pdfIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_8f3b892947a14a2695eea42cdb944a7a.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_off0001e0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0EA 5116 bytes
SHA-256: 517efcaf50a928845d8cd5039d5c08494460e852d4b5c9bfbcf8ec94761e2840
font_01_sfnt_off0001f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F25B 11092 bytes
SHA-256: 9850517256ae39e9dc8b3097d6f35b1e1e224a2a41522b412bf628bbe44d0c1b

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