Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d8e522a94d5661…

MALICIOUS

PDF

74.3 KB Created: 2021-01-16 21:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b432134bb7c9060219c0c2827b667514 SHA-1: cea81bd1c29721047d325e5ef657f7c422746a95 SHA-256: e7d8e522a94d5661869765e8be41af976bab30ecfffbc13fb6a00980b5259abd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it likely serves as a phishing lure or malware distribution vector. It contains embedded links that redirect to a link farm hosted on disposable infrastructure, with one prominent URL being `https://traffking.ru/123?utm_term=ecg+made+incredibly+easy+free+download`. The presence of multiple redirector links and the overall structure suggest an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffking.ru/123?utm_term=ecg+made+incredibly+easy+free+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4392649/normal_5fc99122c4fd5.pdfIn PDF document text
    • https://site-1175775.mozfiles.com/files/1175775/46999986785.pdfIn PDF document text
    • https://vemifibu.weebly.com/uploads/1/3/4/3/134354414/vezopogilevaz.pdfIn PDF document text
    • https://zolidejowifaw.weebly.com/uploads/1/3/5/3/135313364/mezedu_damakibul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383802/normal_5f937f85a4db5.pdfIn PDF document text
    • https://site-1247884.mozfiles.com/files/1247884/54559529688.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/hiuzvhd/basketball_champions_league_americas_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/ptghhfX/fishdom_game_levels.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_5f95babd8ab47.pdfIn PDF document text
    • https://site-1179273.mozfiles.com/files/1179273/sheet_metal_gauge_thickness_chart_metric.pdfIn PDF document text
    • https://xolovimuwoza.weebly.com/uploads/1/3/4/8/134865524/tiwaf.pdfIn PDF document text
    • https://netaterosani.weebly.com/uploads/1/3/4/4/134438803/jokojuzuwureledaxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dukexajuj/sd_pharma_braille_font_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD580 5340 bytes
SHA-256: c621800ad22fd98480ba82f4a75f013a9e3b6e1c20b0376b2c03377d7ad1cb5d
font_01_sfnt_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 11316 bytes
SHA-256: a61232efeb537eeb09c2ffb19fb2ab2fe2cd768fb4acc83bbb022cf0e8262376
font_02_sfnt_off00010e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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