Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad136318551012a…

MALICIOUS

PDF

72.0 KB Created: 2021-01-20 14:27:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9771c0a8ef6c00d7849eafdb7dbe69a3 SHA-1: 42f811324587b61d66ca1ceb3291eeab3ffbea7e SHA-256: 1ad136318551012adb5d2ef267a4ae903d3ff678ac7777b3b2a6562060ca4fbc
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking user interactions for malicious purposes.

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/123?utm_term=pro+series+drag+racing+unlimited+money+apk PDF link annotation
    • https://cdn.sqhk.co/kikolibub/ykgdNqz/tips_for_among_us_impostors.pdfIn PDF document text
    • https://site-1181117.mozfiles.com/files/1181117/asthma_acute_exacerbation_guidelines.pdfIn PDF document text
    • https://site-1242245.mozfiles.com/files/1242245/police_report_for_lost_prescription.pdfIn PDF document text
    • https://pakimisubimoge.weebly.com/uploads/1/3/0/7/130776027/pitotipadebod.pdfIn PDF document text
    • https://site-1172732.mozfiles.com/files/1172732/lab_safety_worksheet_answers.pdfIn PDF document text
    • http://kopavavabigi.66ghz.com/boraguvapowoxapuz.pdfIn PDF document text
    • https://tugokuwotim.weebly.com/uploads/1/3/1/3/131379049/970ae90089410.pdfIn PDF document text
    • https://site-1248223.mozfiles.com/files/1248223/lamanelufiropugatide.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/cPbigje/ripewe.pdfIn PDF document text
    • https://bibomezu.weebly.com/uploads/1/3/2/7/132710601/vibefevufuw-najuruforux-niwidev-panak.pdfIn PDF document text
    • http://damodudajipofem.22web.org/jejosunovadofiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pubexet.rf.gd/xubufulajopisufejux.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/boat_safety_course_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/wizavegejopuzilalogem.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_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 5560 bytes
SHA-256: 67635bf787915e72a24360acea296721064d3562f45407d73a47540634f5a2f9
font_01_sfnt_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 10100 bytes
SHA-256: 619c5dc09a7a1aed91a8ccff4708f834aa76f2d356b95514059878fd929dfae8

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