Malicious PDF — malware analysis report

Static analysis result for SHA-256 191f188852af3ec3…

MALICIOUS

PDF

75.4 KB Created: 2021-05-09 16:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a30c104f19b8b79d0d494580187aae3 SHA-1: 9e7001c9e116ed528fe184edea51bf4dfbcbfaa9 SHA-256: 191f188852af3ec358e1de7b047a28ea7a47fc24d94502fef437fc17c92acaad
226 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. It uses a password-protected-archive lure. 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 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/strik?utm_term=keystone+kstad50b+dehumidifier+manual PDF link annotation
    • http://pabukelib.66ghz.com/how_to_draw_math_diagrams_in_word.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/eE2jgd4/ballpoint_pen_art_for_sale.pdfIn PDF document text
    • https://diwezexu.weebly.com/uploads/1/3/4/3/134310051/a5978f4143.pdfIn PDF document text
    • http://ch-redirect.icu/the_stand_cbs_reviewjzedm.pdfIn PDF document text
    • https://cdn.sqhk.co/nubalevuvem/jguifgf/fonuvitiloxeneri.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/tapupelibejotub.pdfIn PDF document text
    • http://panokaluwavivar.iblogger.org/17369524599.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/ceTjg04/oracle_colorshift_app.pdfIn PDF document text
    • https://tipureroxagojox.weebly.com/uploads/1/3/6/0/136096040/vagifegijozolotado.pdfIn PDF document text
    • https://cdn.sqhk.co/kosuxatune/SR4Yih8/resizuzatuj.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/hcv1yUl/mawudexobetamitafilap.pdfIn PDF document text
    • http://sushibara.net/whats_on_the_ged_math_test_20206czam.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/hdNqifk/fozolosujunit.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/taguxif/34924107906.pdfIn PDF document text
    • http://zolivowubek.epizy.com/86184192384.pdfIn PDF document text
    • http://vasigitosiwow.epizy.com/fabatudexodalifavesafof.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/wowujat.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_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 5688 bytes
SHA-256: 47ca599365971c17dd41fc89231e03a97ee49e07af9778c1bba9fd69b517af26
font_01_sfnt_off0000fcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 10448 bytes
SHA-256: 89b399bec1bb5ee3c62d3abcd3805fd683eb4b8e12419644ebbff00ca58849a4

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