Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ecaf0278e4da01…

MALICIOUS

PDF

71.7 KB Created: 2021-01-29 11:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d4ef167a19718fd909785c0db3d97714 SHA-1: 73408b49f6f6cab1b25f70d12f9f7ce25f93755c SHA-256: 61ecaf0278e4da019d71839bda378957650112da87a2443bb791059b14c7e4e8
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'face change app' and 'online', suggesting a lure to a potentially malicious website.

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://traffine.ru/wb?keyword=face%20change%20app%20old%20age%20online In PDF document text
    • http://lnstagramoriginal.com/80891322359muxak.pdfIn PDF document text
    • https://xadidevoki.weebly.com/uploads/1/3/0/8/130873902/bebip_mupaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5fdc18d3268f7.pdfIn PDF document text
    • http://vanlit.ru/disinaxizaxuzirokajotu4i382.pdfIn PDF document text
    • http://makeyourself.xyz/3931976020333e92.pdfIn PDF document text
    • https://kevelowomovozi.weebly.com/uploads/1/3/4/0/134012304/repufo.pdfIn PDF document text
    • http://dietnatur.fun/meme_sound_meme_soundboardxz013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5fdb60c95a2ef.pdfIn PDF document text
    • http://summer-italy.fun/jerasajopuladobiluvulowidzky.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/legobegutulo/86109159413.pdfIn PDF document text
    • http://nexavej.rf.gd/47715636890.pdfIn PDF document text
    • http://tagitefidunun.epizy.com/28277675652.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/company_audit_report_format_2018.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_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 5016 bytes
SHA-256: 8fa0b2504b10a6fadd37a52a33ec9c212225fe7a6f95a4b03f1f63dde9a1e407
font_01_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 11464 bytes
SHA-256: 2886c4cf08e9f6669b0a3e623fad5aa4f896a7ecd118f5c0ea3c126bbda007b1

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