Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65cd5a12f65b7f3…

MALICIOUS

PDF

84.0 KB Created: 2021-04-06 16:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a55e82fcfc81b56adde84f2380c3d9b8 SHA-1: 8c09f5ed8b1721c4f793a0fefa58ca2aa2da701f SHA-256: e65cd5a12f65b7f345ba2e4b5233988f6d30fa2daae7514cfab60fa4f58655b4
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 0.9990

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://seumenha.ru/strik?utm_term=10+knots+to+nautical+miles+per+hour PDF link annotation
    • https://gavurefeg.weebly.com/uploads/1/3/1/0/131070452/lenuja-toraweto.pdfIn PDF document text
    • https://zakuximonu.weebly.com/uploads/1/3/5/3/135346146/fasonolekupodedoza.pdfIn PDF document text
    • http://sapiwis.iblogger.org/chikati_gadilo_chithakotudu_audio_songs_ing.pdfIn PDF document text
    • http://securespot.ru/tosofotiwonakolovakovofil0c2d.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/haMhdie/block_jigsaw_free_hexa_puzzle_game.pdfIn PDF document text
    • http://namedaun.fun/gartner_studios_template_6140739ore.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/vhijbRz/photo_collage_maker_app_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/eLgrqib/todegeviguke.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/icjfheM/national_football_team_manager_game.pdfIn PDF document text
    • https://madisilusira.weebly.com/uploads/1/3/4/3/134321428/491a5c4323ded.pdfIn PDF document text
    • http://prizinsta.site/old_chevy_for_sale_near_meuwhkr.pdfIn PDF document text
    • https://cdn.sqhk.co/varugefezum/ibrPliR/california_camp_fire_news_report.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/VijMnge/wood_crafts_store_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/gcQgeiu/fomiwurarowowiduxib.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CDWhbqq/bamogapewinifusofenarilog.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/eQojbeu/dragon_online_3d_multiplayer_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/kthcpgg/bottle_flip_challenge_2.pdfIn PDF document text
    • http://lovepositions.info/25417924066pngpp.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/julexekubaj/bts_album_love_yourself_answer_version_f.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/antigona_jean_anouilh.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/benign_prostatic_hyperplasia_guidelines_2019.pdfIn PDF document text
    • http://subuvitoruxev.rf.gd/cipd_factsheet_employer_of_choice.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/50904928431.pdfIn PDF document text
    • http://jarexuvi.epizy.com/autodesk_fusion_360_book.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 5336 bytes
SHA-256: d3e2b35706c07936d9d2bbcc64e1712cc120bfa4283b852985c26c5c81d6bbc9
font_01_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 10864 bytes
SHA-256: dff12bce2d2b532bdbe4b164fd8b0ecf85798dc594546314a23a9cfcd3c66d39
font_02_sfnt_off00012d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D23 16168 bytes
SHA-256: 242633b00dc448d9f1a1c85ff42dca45651c506b10caaa74c4bbd73a060e7376