Malicious PDF — malware analysis report

Static analysis result for SHA-256 615bdf56ed434feb…

MALICIOUS

PDF

75.4 KB Created: 2021-05-29 13:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1cc1ed3512532e4c7508619aebcb98e SHA-1: 5ac386299fd8ccc743b5d2511baa06a2c91e7424 SHA-256: 615bdf56ed434feb3e97d01172e9c07f8b3c26999350180483240a9b146b03fb
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or spamming operation. The document body, though heavily obfuscated, contains text related to 'capture the flag movie songs' and the wkhtmltopdf application, which is likely a lure to direct users to malicious URLs. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=capture+the+flag+movie+songs
    • https://besikedu.weebly.com/uploads/1/3/1/8/131871581/pobuzawawerogixe.pdf
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/vuzudewoba.pdf
    • https://cdn-cms.f-static.net/uploads/4448096/normal_604753735ec39.pdf
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/sonam.pdf
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/e2cf9a6024027.pdf
    • https://cdn-cms.f-static.net/uploads/4465125/normal_6035c9205a1f5.pdf
    • https://guzifako.weebly.com/uploads/1/3/4/0/134096492/1e0b2b6ed6b1.pdf
    • https://jutisopi.weebly.com/uploads/1/3/4/7/134775863/potomoduje-mipimafinuru-renom.pdf
    • https://mibiduzomezo.weebly.com/uploads/1/3/5/3/135327428/wawizuwewe_depazatigamodal_fakajisile.pdf
    • https://sifoginugiji.weebly.com/uploads/1/3/4/5/134588619/fewugiv.pdf
    • https://static.s123-cdn-static.com/uploads/4462344/normal_5ff3aa7c3e1ca.pdf
    • https://lujajumivovun.weebly.com/uploads/1/3/0/7/130776132/870bfc65e93d73.pdf
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/pirafesizopunovu.pdf
    • https://cdn-cms.f-static.net/uploads/4445881/normal_5fda872bbbb4e.pdf
    • https://static.s123-cdn-static.com/uploads/4393904/normal_5ff05b796e9f3.pdf
    • https://static.s123-cdn-static.com/uploads/4444092/normal_5fedbcfb4c88d.pdf
    • https://dupemokuko.weebly.com/uploads/1/3/4/7/134759865/1907226.pdf
    • https://delidanazej.weebly.com/uploads/1/3/2/6/132681463/fefusu.pdf
    • https://cdn-cms.f-static.net/uploads/4414339/normal_6036221e93db7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bd.bin
cf0176f8c1b21abc65daebe207dc3585a00b3d8a247a96639f0cfd5dd922caa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 5280 bytes
font_01_sfnt_off0000fb93.bin
d1037085e68f9e7aa88125633c7d21e7f6025b41ea2905782c36e7d5f5c741c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 10968 bytes

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