Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af1e94dd8840071…

MALICIOUS

PDF

77.3 KB Created: 2021-01-11 04:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 938553abe1e608173f91e812a46fc88a SHA-1: d5cf4e36f7c064fdf9f83b1e982fe2694e16f72f SHA-256: 8af1e94dd88400711d35bbfcf89517c45288f75ae52a1be8201474a83e9006b0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and known redirector infrastructure, indicating an intent to lure users to malicious sites. The PDF structure and link farm characteristics further support its role as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://traffmen.ru/123?utm_term=2nd+anniversary+gifts In PDF document text
    • https://cdn.sqhk.co/litalile/ibYg4gi/appleton_mn_weather_10_day_forecast.pdfIn PDF document text
    • https://site-1176272.mozfiles.com/files/1176272/natawivawuvanodedi.pdfIn PDF document text
    • https://site-1187178.mozfiles.com/files/1187178/neliwopiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_5fac15ad4a20a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393362/normal_5fd098205e7ea.pdfIn PDF document text
    • https://site-1176492.mozfiles.com/files/1176492/84902912740.pdfIn PDF document text
    • https://site-1168059.mozfiles.com/files/1168059/vikings_series_6_part_2_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/6iaPyA3/vikudunawufukomerefor.pdfIn PDF document text
    • https://cdn.sqhk.co/libidexa/eFjfgeu/21785862723.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/fzhijh7/pikuberidupabunu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494668/normal_5fc39fa46f913.pdfIn PDF document text
    • https://site-1176701.mozfiles.com/files/1176701/free_classdojo_app_for_parents.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_5fba74eb0185b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5fd5f575853f5.pdfIn PDF document text
    • https://cdn.sqhk.co/lerotakisisa/iigfujg/16939310362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_5fac2885ef95e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f96d4d899bc3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 5244 bytes
SHA-256: d8103f96d1fd48feec339df94ffef7d3d428763e20ce9702f3d70adbbe572670
font_01_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 10532 bytes
SHA-256: 43c4b71a9fe00330036054f49b3e448b6a7fdef4b3e71bfebf5f3d1b034822b7

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