Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04918dfb6a55189…

MALICIOUS

PDF

76.0 KB Created: 2021-03-08 02:39:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 997b0f01e8844fb06d4212920b9c84e3 SHA-1: 0c5efbf3c37227f634ea9889458ca00ca703772e SHA-256: b04918dfb6a55189cc5091c61fed9add16180fe539d26436fefc1e1aae9b2a69
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 0.9989

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://fokemale.ru/wix?keyword=grammar+explorer+2+answer+key PDF link annotation
    • https://cdn.sqhk.co/bugininaxi/pggngcI/71755851991.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/fSDBkSm/first_aid_kit_america_album.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/how_to_get_rid_of_red_acne_spots_on_face_fast.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/jehjxmP/formula_e_race_car_price.pdfIn PDF document text
    • https://cdn.sqhk.co/fumediju/hfjyRgh/zijivepudada.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/chamberlain_universal_remote_genie_intellicode.pdfIn PDF document text
    • https://cdn.sqhk.co/nedivixozu/yhcic2f/13456125978.pdfIn PDF document text
    • http://didazema.mypressonline.com/telling_yourself_the_truth_audiobook.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/shakespeare_sonnet_30_sparknotes.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/wOKJwhj/76413537310.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/42535558692.pdfIn PDF document text
    • https://cdn.sqhk.co/wapogade/eoiiLic/zaduxevutexowedobusozuvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://sukokovevaz.atwebpages.com/grasslin_timer_gm40av_instructions.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_6dd5caf519274127ae4aea4d02d70f3c.pdf?index=trueIn PDF document text
    • http://kikanelomer.onlinewebshop.net/negumafoxazuwaweb.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/samsung_front_loader_washing_machine_good_guys.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/kewan.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/unreal_engine_android_game_list.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/ginujoka.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/videoder_14._3_premium_apk_free.pdfIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_369f335128f94982bdc17aefcd9203cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/defujo/fubivepijarufiki.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_1fa3b5bde99646bd8a9cf9d0b4f93893.pdf?index=trueIn PDF document text
    • http://medexode.atwebpages.com/59426508026.pdfIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_4a7fe967139544f18086940ef4f2a5b5.pdf?index=trueIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 5452 bytes
SHA-256: f4a9b2b5475697cfd900f80ee1d53862df430e785ff40ca53eb1cd8bcc6a1cc5
font_01_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 7644 bytes
SHA-256: 510391ca8217d4fe375aeeb1060470f5c4203d87bf8e0665381ba83314ea7296
font_02_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 10148 bytes
SHA-256: c72659db9dc9385418f6e2611d3744020617182c2de7efda1e90a1cfa1ea9066