Malicious PDF — malware analysis report

Static analysis result for SHA-256 993ec0bbc43a74a4…

MALICIOUS

PDF

193.5 KB Created: 2021-01-26 00:44:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7789b474dcd61815fd57c3fc80dd9f8e SHA-1: dd51ca5910ab6a73cf30ecc0b6fdc8ae8e1bec37 SHA-256: 993ec0bbc43a74a474780d347dcf9fafe39f0628d49eb52d590fa28905a8aee5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to exploit users via external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?utm_term=the+great+gatsby+quotes+tom%2527s+wealth PDF link annotation
    • https://xevekefipozi.weebly.com/uploads/1/3/1/4/131406281/93dccb309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_600b25f7d850f.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/ib14ihO/kawij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407789/normal_5fe9d2dbce160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411231/normal_600bcedccdb8e.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/8722417.pdfIn PDF document text
    • http://tonalemeketav.66ghz.com/71291864038.pdfIn PDF document text
    • https://cdn.sqhk.co/naveropifo/hjhjejh/birds_of_prey_cast_2002.pdfIn PDF document text
    • https://loworukad.weebly.com/uploads/1/3/5/3/135312099/pazitivudabiran.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464303/normal_5fc71debb105e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_5fd67d5f466c1.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/eEhi8AH/alienware_mouse_610m.pdfIn PDF document text
    • https://xomilazarega.weebly.com/uploads/1/3/4/5/134511507/gepejatev.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/lomuper/53540791898.pdfIn PDF document text
    • http://dejogamolefip.rf.gd/sawirikabogaz.pdfIn PDF document text
    • http://tezipibuboxigo.epizy.com/scrivener_for_windows_crack.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_off0002bf6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BF6A 5544 bytes
SHA-256: 287e3fcddf9588acd27c33ff965b588b2a9c6ec45b9758a855bd029008a23d13
font_01_sfnt_off0002d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D239 11192 bytes
SHA-256: cd81dbe91083bad0e3aa9942866aac41cfa2a3465237857ed61a25225d581847

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