Malicious PDF — malware analysis report

Static analysis result for SHA-256 854dda8db6028455…

MALICIOUS

PDF

77.7 KB Created: 2021-05-08 03:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 71b2a90834bd0aa436d77425f254d983 SHA-1: 6f502c634a13be3837d363d08d7eb2c75826468e SHA-256: 854dda8db60284555588109dba05f0cdab13e723a04bc8958a21ab4d8da886e9
186 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, indicative of a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=i+am+statements+pdf PDF link annotation
    • http://tixomuwenape.22web.org/assignment_front_page_ignou.pdfIn PDF document text
    • http://nuveclovet.xyz/bible_passage_about_the_blind_man8715c.pdfIn PDF document text
    • http://pitofoj.iblogger.org/raising_a_modern_day_knight_study_guide.pdfIn PDF document text
    • http://erkutungotu.com/how_to_calibrate_bosch_glm_30uvecw.pdfIn PDF document text
    • http://letxxnx.org/birletirilmi_snflarda_retim_ders_notlar2ef4f.pdfIn PDF document text
    • http://minuette.me/dejemejatodur3x843.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.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/sagotomagin/69155281771.pdfIn PDF document text
    • http://josekew.epizy.com/ayat_ruqyah_download.pdfIn PDF document text
    • http://rivebop.epizy.com/baxivewubenowuji.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_d67f2e29200342a99055d6156f493ae1.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_6e67574342f447848a42f1ef75dc91f4.pdf?index=trueIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_af238d1baa9841a6a746a50689806295.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/087a7403-5d68-4487-b88b-538961c3e669/how_to_add_buttons_in_wix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2125bd8c-e0bd-4e30-9f29-ff8e18e1d2d8/focusrite_scarlett_solo_2nd_gen_driver_windows_xp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f99828-4fe8-47c8-ac05-a01576c5c7a9/97469223329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df4bd9b-c4f3-4d20-b08f-d63ce52daf6f/kenomovagomexakew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e662c283-2dc8-4d1a-bbfb-b1768a21d000/gujitijixemokupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a35e17-a0bc-4312-b256-e52ccd4acefb/43307900745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8183ac3-396f-49ea-865c-1a4ba05982a2/how_to_get_a_replacement_identification_card_online.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/butevabovedimaposanerul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44fead00-2353-4720-b610-f8eaec571b27/gnostic_teachings_what_is_ego.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_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 4996 bytes
SHA-256: a8310e2eb28fd66fb22738952ba93730283681cb23913118da0b02041b7de212
font_01_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 11496 bytes
SHA-256: 79ee918fff300e892c89b0acc595b69ddde3b061d6bd84e265561dc7d6569af9