Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f319574b864d87…

MALICIOUS

PDF

91.3 KB Created: 2021-02-14 07:15:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7a816279f14dab1c484c122df581ee08 SHA-1: 4c228a646e2f3c74ce5f653149cdcbaf16dd7777 SHA-256: a1f319574b864d87998200941505036480045e1f5cf64b2b4a104e321cfd8b00
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and an ML classifier, with a critical alert for linking to known malicious redirector infrastructure. The primary malicious URL observed is https://yafferge.ru/aws?utm_term=sentence+checker+free. Although no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/aws?utm_term=sentence+checker+free In PDF document text
    • https://cdn.sqhk.co/roretuduva/6gdjjhg/build_a_bear_harry_potter_coming_soon.pdfIn PDF document text
    • http://muldwych.com/humans_vs_zombies_gateched2fl.pdfIn PDF document text
    • https://cdn.sqhk.co/tumokufagu/jecidja/25112904326.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/hhgeibD/hacker_s_keyboard_dictionary_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gotirawuz/BheW5ib/sekawiloza.pdfIn PDF document text
    • http://tegor.xyz/bloom_s_taxonomy_lesson_plansjzp2o.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/sudevejerifu/posavugukiver.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/pikisavapevugiku.pdfIn PDF document text
    • http://bexumonege.rf.gd/firuxibevejamozika.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/jewelry_design_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/new_colors_tv_app.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/datetimepicker_format_12_hour.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/canon_ip7200_manual.pdfIn PDF document text
    • http://pixelub.rf.gd/nozaliwokojivibi.pdfIn PDF document text
    • http://jigabez.epizy.com/cyclone_song_djpunjab.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/80983573425.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/jejuwodudivunesariwut.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/tinegajebedixup.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/t_shirt_black_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/26529672414.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_off00012bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDC 4716 bytes
SHA-256: df939623100d29ca615b88e63fdc078b12da48d5ad1fc93cb75c2fc228573175
font_01_sfnt_off00013be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE6 10532 bytes
SHA-256: a4f2a73544dcc084e8b4e70880dfb4d25bc3bd002062dd7892ae9b4a40eac77c

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