Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf66c7490cee7b3d…

MALICIOUS

PDF

71.8 KB Created: 2021-04-04 23:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3ff20fdcc117d30df295bec902344075 SHA-1: 5f82d21f14de155d0c4b75f2505095ca2a118651 SHA-256: cf66c7490cee7b3d05d8a5920bb417a08604bc02849c7f6bebafc8542247ced6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://maypoin.ru/wix?keyword=ifakara+health+institute PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470699/normal_6037244c2f62b.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/ece076fd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_5fdad718bc393.pdfIn PDF document text
    • https://bepifesak.weebly.com/uploads/1/3/4/0/134096259/negezileta_galixur_vurezafikibejon.pdfIn PDF document text
    • https://kuwuxezito.weebly.com/uploads/1/3/6/0/136090431/1f8df802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381737/normal_6018e667ad23b.pdfIn PDF document text
    • https://cdn.sqhk.co/puvijupem/ehfJhea/81000874353.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/3720221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_6054ceffeb26c.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/hlnFhgg/old_photo_effect_photoshop_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6622756-7798-4f3a-b69b-c80b0cfd280b/21816793985.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/expectation_gap_in_audit_report.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/73122501344.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/joraninunamefokoxefavevu.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/does_the_bible_say_only_god_can_judge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3665f8a-ac85-42b8-8a76-414c7c590335/baldurs_gate_dark_alliance_gamecube_cheats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51bc7da2-23e9-4556-a789-855fb9d11e01/video_games_lana_del_rey_cover_tiktok.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/fujizamikivimipasopimasig.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/psat_practice_test_2_answers_fall_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/sahidic_coptic_new_testament.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_off0000da55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 4856 bytes
SHA-256: 7ab32c56847a9a867d6e64dd2cfc12db2c083e3277043750a5b2266c741e1e34
font_01_sfnt_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 11560 bytes
SHA-256: b63a5311e23d0f114a677447e6ad1825e363edce719e38c59e19df2bdee5ce44

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