Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1b404f50d7a79c…

MALICIOUS

PDF

76.0 KB Created: 2021-04-03 20:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3c16856560d954989e5d8bc14616b35 SHA-1: bca280f1336c65cdd13e1b851afbb914f63b5855 SHA-256: be1b404f50d7a79cdaf0e73f20b9e63fb77b67c107b69272e18d5b82e0b0a550
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous embedded URLs pointing to disposable domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to pellet stoves, which is a common tactic for phishing or malware distribution.

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
  • 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 http://balegetiwep.mywebcommunity.org/augusto_cury_livro_ansiedade_2.pdf
    • http://gunofixe.medianewsonline.com/simile_examples_sentences.pdf
    • http://pokemonrivals.online/how_to_test_for_drivers_licenseu3s0v.pdf
    • http://runmasten.online/77982204680eeb7u.pdf
    • https://static.s123-cdn-static.com/uploads/4385869/normal_5fe1f0a1a158f.pdf
    • https://cdn.sqhk.co/titesojijuko/icMhjpB/kevigudu.pdf
    • https://cdn-cms.f-static.net/uploads/4369777/normal_604b1b9631473.pdf
    • http://pazolozul.mypressonline.com/35430930467.pdf
    • http://ryduslim.website/princess_bride_full_movie9pwt1.pdf
    • https://cdn.sqhk.co/romilononove/jjwUwia/18646114534.pdf
    • http://formverifiedbadge.com/foludamezuvaxadepof3zkvs.pdf
    • https://static.s123-cdn-static.com/uploads/4503390/normal_60076e33c85aa.pdf
    • https://cdn-cms.f-static.net/uploads/4481417/normal_602ec36943a3d.pdf
    • http://tobaliwono.mygamesonline.org/20853262085.pdf
    • http://cloudmarket.website/bow_wow_ciara_like_you_mp3_downloaducxu6.pdf
    • http://jedilinosur.mywebcommunity.org/vivofaf.pdf
    • https://cdn.sqhk.co/lebogomatoze/6ZpsuKT/power_warriors_12._0_apk_download_unlimited_money.pdf
    • https://cdn-cms.f-static.net/uploads/4447447/normal_603f1485e5adf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/WboozbXZlIE/wb?keyword=why%20isn
    • https://uploads.strikinglycdn.com/files/0e292494-8147-4b70-b13b-e950779c4cdc/what_type_of_oil_does_a_2017_nissan_pathfinder_take.pdf
    • https://uploads.strikinglycdn.com/files/079a1708-530f-4488-82eb-3be85dc3388a/rapobenakusiwu.pdf
    • https://uploads.strikinglycdn.com/files/17e3413b-9a00-4bde-a6dc-ebccb4830b31/canon_mf4450_printer_driver_64_bit.pdf
    • https://uploads.strikinglycdn.com/files/b5dbae3c-690a-447b-a870-03e19f1bbaea/games_to_play_in_class_on_paper.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4e.bin
71a0eeeddb761df8306c37ee711ee58c547c885c091bd005fa1e3ee346daa2f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 5356 bytes
font_01_sfnt_off0000fc8e.bin
6d30c87cdf169fe8d17a2e2380f21e8c2fdaa2cc2cd36227984ca632f89fae6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 11044 bytes

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