Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4beb276f8a8c349…

MALICIOUS

PDF

89.1 KB Created: 2021-04-03 18:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 476e4279a041545f829a74e8b02724d7 SHA-1: 5b49284aded4821bd917bb4cf54dc039df8c5f64 SHA-256: a4beb276f8a8c349297d159d16f9abc0a67d1c11d8a15f22d95fbc3484318a8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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 https://crophysi.ru/strik?utm_term=bluedio+turbine+t2s+wireless+bluetooth+headphones PDF link annotation
    • http://instasale.company/sandwich_maker_recipes_chicken5vsqp.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/what_are_the_main_traditions_of_christianity.pdfIn PDF document text
    • http://macsk.space/plenty_of_fish_app_freew17jy.pdfIn PDF document text
    • http://lisolu.org/what_is_scapy-python3rnqp2.pdfIn PDF document text
    • http://7lessons.space/lugogefegamadusiwimufela5w2vq.pdfIn PDF document text
    • http://catsism.com/dividing_polynomials_box_method_worksheetu5myv.pdfIn PDF document text
    • http://fixmarker.fun/pizinufutiwomolhfhe2.pdfIn PDF document text
    • http://ryukzak.digital/poserin0g6ji.pdfIn PDF document text
    • http://boevoenlp.com/funny_gif_and_memesfr6zl.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/alfonsina_y_el_mar_guitar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xiniwipilanaju.atwebpages.com/20461775082.pdfIn PDF document text
    • http://loxogosune.rf.gd/nuxatumigojarogerivoji.pdfIn PDF document text
    • http://rivowotow.epizy.com/brazil_world_cup_2002_formation.pdfIn PDF document text
    • http://ronojegev.rf.gd/kundali_matching_application_free.pdfIn PDF document text
    • http://vefazuxugog.rf.gd/bopirex.pdfIn PDF document text
    • http://lakekawe.rf.gd/aptamil_pepti_2_feeding_guide.pdfIn PDF document text
    • http://bidejepeko.onlinewebshop.net/chinese_english_dictionary_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a6aa7b-bcd1-4e3f-bbcb-8dcdb417bd4f/gasemasavojegizokew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e69a3e-3b15-4029-95f9-9ad3450301bf/lezonalofawitofijimukura.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11319 5340 bytes
SHA-256: 84302ab835f3ba84e55b385074085eacfbafc4d7c3bbe4430fe92b2a8b3820d4
font_01_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 10396 bytes
SHA-256: 4affe489212cc1b9f50c3485a4413dfb98830ac26ce927ea35a295d543accf63
font_02_sfnt_off000148ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361