Malicious PDF — malware analysis report

Static analysis result for SHA-256 13093c613fc0b5a1…

MALICIOUS

PDF

68.9 KB Created: 2021-01-21 16:33:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 8e1ce0ac807ae27ee5d603670a5ed557 SHA-1: 2516e84d17dbb6e96ec19467a94fe980ed00ee9e SHA-256: 13093c613fc0b5a156489ef4e45cca5c9f397520b511a559c0fa45aeb3fbcb1f
184 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, one of which is identified as a malicious redirector. The document's content, though heavily obfuscated, appears to be a lure for downloading software. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme.

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/wb?keyword=ultimate%20offroad%20simulator%20mod%20apk%20download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_5fad8425b442f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388040/normal_5fffe9810fbbb.pdfIn PDF document text
    • https://site-1168030.mozfiles.com/files/1168030/21553242475.pdfIn PDF document text
    • https://site-1220496.mozfiles.com/files/1220496/50370536326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412774/normal_60004387ef395.pdfIn PDF document text
    • https://site-1248205.mozfiles.com/files/1248205/format_code_integer_python.pdfIn PDF document text
    • https://poxosuliw.weebly.com/uploads/1/3/1/3/131383655/delev.pdfIn PDF document text
    • https://site-1247543.mozfiles.com/files/1247543/bernie_sanders_joe_rogan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405208/normal_5feb73b7a631d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_5f91453e5b73c.pdfIn PDF document text
    • https://site-1172743.mozfiles.com/files/1172743/27757862479.pdfIn PDF document text
    • https://site-1194434.mozfiles.com/files/1194434/arduino_iot_projects_book.pdfIn PDF document text
    • https://sutapupimode.weebly.com/uploads/1/3/4/6/134615637/6302583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477655/normal_5fd60ec2e4fed.pdfIn PDF document text
    • https://site-1175575.mozfiles.com/files/1175575/answers_to_jumble_word_game.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_off0000d075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 5336 bytes
SHA-256: fd4c2de9727686f907206be4e3e52d1a473c0d75a88c8e41bab872142db3a9c2
font_01_sfnt_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 10560 bytes
SHA-256: 89237fce072579638670935049eaece9d5d8c1603d2761f1c3b721756febc6da

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