Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a8ac2bd0124012…

MALICIOUS

PDF

82.2 KB Created: 2021-02-20 02:28:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 33f05eef7eeb012e88c0e36053c59324 SHA-1: 3bcda8cab5f76c00aa99c3425a815d0a958bdf16 SHA-256: 45a8ac2bd0124012a2cec357264703783eff99fc00034a07381dcaf5edbb0539
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded links, many of which point to disposable domains or redirector infrastructure, indicating a phishing or scam attempt. The primary malicious link identified is https://yafferge.ru/strik?utm_term=does+30+day+fitness+cost+money, which is associated with known malicious redirector activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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/strik?utm_term=does+30+day+fitness+cost+money In PDF document text
    • http://zipimenegan.iblogger.org/android_studio_background_color_white.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402519/normal_60055631dbf8e.pdfIn PDF document text
    • http://nashremont.site/wirajusk23w.pdfIn PDF document text
    • http://jumbochecker.com/chaitrada_premanjali_film_songsx9olx.pdfIn PDF document text
    • https://cdn.sqhk.co/tijanukubo/hdgjjcH/tutorial_edit_foto_di_lightroom_android.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/YPijvYm/kaxobez.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/gjWgche/10470318836.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411937/normal_5ff625308d969.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pomuvoxibi.epizy.com/bed_bath_and_beyond_sheets_twin_xl.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/21446334403.pdfIn PDF document text
    • http://kabewusibun.epizy.com/how_to_get_a_free_phone_with_metropcs.pdfIn PDF document text
    • http://rapudipawuv.epizy.com/mekepevajozo.pdfIn PDF document text
    • http://sibexelopuni.epizy.com/metal_gear_solid_portable_ops_cso.pdfIn PDF document text
    • http://boraxatisota.rf.gd/62818494037.pdfIn PDF document text
    • http://kinipojip.rf.gd/lizajosejirebogovavawijub.pdfIn PDF document text
    • http://zopezotudesod.rf.gd/anarkali_movie_songs.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_off00010474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 5444 bytes
SHA-256: 565e493e1a17dcef8528b4d2484a641af9e6d23a61e98f2d0d9b13ea28208d2f
font_01_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 10756 bytes
SHA-256: df79576fec68f8ab7bb6dc5253576020719eb8840d3e3eeb6e88716f08e8e409

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