Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc7aebae96decd1…

MALICIOUS

PDF

72.2 KB Created: 2021-03-24 19:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a55b965c7946d85e292a81408de460e0 SHA-1: dd84656372b0d55a017bed65cc4d3e261f46971d SHA-256: 7bc7aebae96decd1ff2cc716d5c8695a894704702e8a0c23f3b92e89a6ab57c4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external links, many pointing to disposable domains or potentially malicious content. The PDF's structure suggests it's designed to redirect users to a large number of external sites, likely for phishing or to serve as a link farm for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=how+to+train+your+dragon+3+streaming+canada PDF link annotation
    • http://italiahot.space/inpixio_photo_clip_7._02ut23.pdfIn PDF document text
    • http://marketitaly.pro/wakupebodiluwib8x.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/ugjLRja/2014_dodge_dart_rallye_engine.pdfIn PDF document text
    • https://jefiwoso.weebly.com/uploads/1/3/5/9/135996081/jitoden_fusarutab_duwexalerufebew_vuwidefutep.pdfIn PDF document text
    • https://judexibegajojid.weebly.com/uploads/1/3/4/8/134885636/dujotafaxamu_vefuzi_dapezalamogoler.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/9jchwhh/commercial_bank_of_ethiopia_mobile_banking_apk.pdfIn PDF document text
    • http://train-home.ru/becoming_a_person_of_influencesurtq.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/40232cfc7.pdfIn PDF document text
    • https://kunudixi.weebly.com/uploads/1/3/4/6/134667289/lulexuvebo_jaxewopox.pdfIn PDF document text
    • https://juladugalevatib.weebly.com/uploads/1/3/4/3/134385664/d114a7cdc.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/XcjbZZW/edmodo_app_download_for_pc.pdfIn PDF document text
    • http://mmamba.ru/23092891076cyf0x.pdfIn PDF document text
    • https://cdn.sqhk.co/figesuweno/hcBgigc/blank_animal_cell_diagram_to_label.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/he2Sgch/furious_road_imdb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1ceeeb-5ae2-45b4-a01a-11c9730857c6/what_is_a_good_hobby_to_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea47833-61be-40a3-bb0f-0fc89a1729d9/1971955201.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_41cc137eb4094b56b9aecd1e00e6d299.pdf?index=trueIn PDF document text
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_4de30f9efd324500ab42b30b17b1cd79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c1d1375-9ba7-44b9-943a-5f18f8ef9075/sense_and_sensibility_2008_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d830f7-ba35-4000-9f67-97e571046909/wamutofereravetumuriwete.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 5548 bytes
SHA-256: 8d71780fb37e09ecf85a596071ce4e2b7761a29e48355063ae919e8c4642278b
font_01_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 10380 bytes
SHA-256: dd223ade1022d5bcadc4256827b876c965f03229989d3e6c424c4e1b70fcf2c1