Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b57d979ac45ac08…

MALICIOUS

PDF

74.5 KB Created: 2021-01-13 02:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dc76d24eeb9702302f2e3f37537866f9 SHA-1: a5afc518f3d0a2c5cfe304517073b28313521cca SHA-256: 3b57d979ac45ac08265204c7d914896f9d5563b3838f3a70ffef0413962b9a85
186 Risk Score

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 6

  • 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.
  • 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://trafftec.ru/aws?utm_term=html+button+type+submit+form PDF link annotation
    • https://sigegasolo.weebly.com/uploads/1/3/4/7/134732441/bbf290ea0358f.pdfIn PDF document text
    • https://site-1173903.mozfiles.com/files/1173903/66493248194.pdfIn PDF document text
    • https://site-1084247.mozfiles.com/files/1084247/rozezirovixawe.pdfIn PDF document text
    • https://site-1175575.mozfiles.com/files/1175575/flipkart_customer_care_phone_number.pdfIn PDF document text
    • https://kumumejetosen.weebly.com/uploads/1/3/0/9/130969188/b1fca0fb6e1.pdfIn PDF document text
    • https://site-1178774.mozfiles.com/files/1178774/flashscore_livescore_live_soccer_scores_sports.pdfIn PDF document text
    • https://site-1175108.mozfiles.com/files/1175108/best_friends_forever_song_from_lego_friends.pdfIn PDF document text
    • https://rapexinet.weebly.com/uploads/1/3/4/3/134328854/fusasabirogep-kejalefifiborew-wivapawawamepu.pdfIn PDF document text
    • https://cdn.sqhk.co/lutugivaje/mhgtCSt/infinite_painter_app_free_download.pdfIn PDF document text
    • https://site-1177214.mozfiles.com/files/1177214/new_xbox_app_beta_ios.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/9777323.pdfIn PDF document text
    • https://site-1180908.mozfiles.com/files/1180908/79925255045.pdfIn PDF document text
    • https://tamilavijunaw.weebly.com/uploads/1/3/4/5/134506647/nujovojuxi.pdfIn PDF document text
    • https://site-1174809.mozfiles.com/files/1174809/rec_screen_recorder_ipad_with_audio.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/fexuror/ravesetujevomafelifif.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_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 5040 bytes
SHA-256: de146c817337bad053712e2dd76b0ec21e1c90187fe61670fabb0d787e22c1b8
font_01_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 10680 bytes
SHA-256: a5f5fe4a4b6f91901abc55c2e0300d3bd52044a6cf7919935bf0133aa296891b

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