Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfb9c7f87a84abc…

MALICIOUS

PDF

88.9 KB Created: 2021-04-19 05:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b7a76ab130dc361f04bd8bc7289d7391 SHA-1: 27de323a04f7089790eb8a47a9d9470920c45449 SHA-256: acfb9c7f87a84abc8e7415d671ace179055200803af0fba3ec49221a8f3dcc72
226 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates a strong phishing attempt related to financial information. The embedded links likely serve to redirect users to malicious websites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://mezovuduw.ru/strik?utm_term=wd+my+cloud+ex2+ultra+setup+mac PDF link annotation
    • https://cdn.sqhk.co/podidiwi/hbDifja/music_bass_boosted_equalizer.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/b6ycXwE/bapebemukululaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/hHUzVCP/basketball_3_point_shot_term.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/ghfhjdf/52681706974.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/arabic_dictionary_download.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/apiculture_process.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/jjbgghf/niwelikiz.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/rodivegixaxajomodewa.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/godewumazek/wulinagemetore.pdfIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/biodiversity_conservation_seminar.pdfIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_ea2a1081db6043dc9f02f70908704e59.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/068d1908-88e3-4b58-8f02-a421aa9a8b96/nuturasamokomotuxovevez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb744872-acd5-4d89-821b-d01e29dcb497/sekasipabilatavaner.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/birotawajurifegeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f894309c-9fed-4fff-8be0-c3ee548f0ad2/how_to_apply_for_covid-19_unemployment_benefits_600.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/electronic_arts_games.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/joseph_prince_communion_sermon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56676386-8ba5-4e04-9578-b9adc64f9e12/tevutilamoxajevopidami.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/30276735484.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_69406675a88148a8ae781abbb75112a2.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 14960 bytes
SHA-256: 739a86b559385a85a80db3e7f45a4f8984746317131a63a2574b48dc450f58b3
font_01_sfnt_off00011ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA6 5532 bytes
SHA-256: c7c1d604578e46815ca808631d0c7ab28fa9c2dbcd10e03d77e2b6119605f08e
font_02_sfnt_off00012e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E77 11884 bytes
SHA-256: 9b51b69473e6a3240ec9d1b0d0c9348ec2b1471605d6b79e354e862504edde65