Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea518d806231d1d…

MALICIOUS

PDF

83.2 KB Created: 2021-01-18 17:17:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1878c494e754311c9b0ac833bc66817d SHA-1: 0b14f1a4cfe918f6d2f8ad89fed803e08b4c0e66 SHA-256: fea518d806231d1d75e155fa4d828e8e3b5e164f9b1d1451fc593cead367b268
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm, likely intended to redirect users to malicious websites or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs and the link farm structure suggest an attempt to exploit users through deceptive content, possibly as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://maypoin.ru/123?utm_term=evolution+and+revolution+as+organizations+grow+ppt PDF link annotation
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/641ec61952c.pdfIn PDF document text
    • https://site-1179485.mozfiles.com/files/1179485/pulsar_music_player_pro_apk_mirror.pdfIn PDF document text
    • https://ruvatekokero.weebly.com/uploads/1/3/1/4/131437102/jejedupavado.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/9lghCjh/50805329646.pdfIn PDF document text
    • https://kavaxaxogemiren.weebly.com/uploads/1/3/4/4/134441995/6764565.pdfIn PDF document text
    • https://cdn.sqhk.co/mezomabesoki/LhjfVNd/brutal_hockey_fights.pdfIn PDF document text
    • https://cdn.sqhk.co/wowobavukelo/igtijga/space_harrier_arcade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fcad2efa24f3.pdfIn PDF document text
    • https://pukegivox.weebly.com/uploads/1/3/1/8/131856392/bdae44dd7345d09.pdfIn PDF document text
    • https://cdn.sqhk.co/vomikigiw/tuqjaja/playing_card_deck_display_shelf.pdfIn PDF document text
    • https://cdn.sqhk.co/notigagamu/VggjbtF/tasub.pdfIn PDF document text
    • https://site-1176005.mozfiles.com/files/1176005/maharashtra_state_board_10th_std_science_textbook.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/djfhinx/flameless_led_candles_remote_control_instructions.pdfIn PDF document text
    • https://site-1173610.mozfiles.com/files/1173610/68528306884.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386347/normal_5fe006948a1fb.pdfIn PDF document text
    • https://cdn.sqhk.co/devurekon/xii1hds/13151969550.pdfIn PDF document text
    • https://site-1221949.mozfiles.com/files/1221949/air_force_fighter_jets_1950_s.pdfIn PDF document text
    • https://site-1172679.mozfiles.com/files/1172679/duplicity_book_by_newt_gingrich.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f8733eb3ef60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000105d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 5288 bytes
SHA-256: ab93bd860fb376a9e818808ad7ec0c8b2398cf98383a167daf1f8b7e1e696936
font_01_sfnt_off00011800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11800 11540 bytes
SHA-256: b55134c1d85d07c765fe68b71e59b5d5f3f76eedc7156ac36668ef8935552e0a

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