Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82404a4d103002c…

MALICIOUS

PDF

72.5 KB Created: 2021-02-22 20:59:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c7dbdc03d3023083878c78aeefc940d SHA-1: dd84061813c17e4be7b34ad63f64ed6c99bc35bc SHA-256: e82404a4d103002cc8edc90874f816e999d22c50c288a7f7f74ab9e71ed1ac12
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to '16personalities accurate reddit', aiming to trick users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-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://jottigo.ru/123?utm_term=is+16personalities+accurate+reddit
    • https://static.s123-cdn-static.com/uploads/4489583/normal_600603f0d4558.pdf
    • http://filanion.online/4th_grade_math_test_questionsu0hde.pdf
    • https://bagerinev.weebly.com/uploads/1/3/1/6/131636948/3622602.pdf
    • http://dkmz2.club/21144288158gwp4g.pdf
    • http://cmb-societe.com/39477716650hzliq.pdf
    • https://pedadadaroteb.weebly.com/uploads/1/3/0/9/130969242/3232758.pdf
    • http://sentytld.online/lobisuliganezemalutisqy33.pdf
    • https://static.s123-cdn-static.com/uploads/4366057/normal_5ffd5bd3243d0.pdf
    • https://javekekowunafot.weebly.com/uploads/1/3/5/3/135324960/risidumi.pdf
    • https://jigebizelu.weebly.com/uploads/1/3/1/4/131438259/1609387.pdf
    • https://damobupakul.weebly.com/uploads/1/3/1/4/131453350/rosim.pdf
    • https://static.s123-cdn-static.com/uploads/4450870/normal_5fe484825f614.pdf
    • https://jagobedumaniso.weebly.com/uploads/1/3/0/8/130873939/d23a15ed8e36215.pdf
    • https://xevezuwojuko.weebly.com/uploads/1/3/0/7/130740392/gemosajuwawon-selexafemovifix-jiretadawe.pdf
    • http://smirno.life/male_female_voice_changer_app_for_androidn4k8f.pdf
    • https://zoguripan.weebly.com/uploads/1/3/1/0/131070442/9b28c30d4.pdf
    • https://pebuzifidam.weebly.com/uploads/1/3/2/8/132815752/4431828.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gapivegek/ritavupame.pdf
    • https://s3.amazonaws.com/fewunadupop/97640839581.pdf
    • https://s3.amazonaws.com/vovuzize/6154976588.pdf
    • https://s3.amazonaws.com/divexikav/fortigate_200d_ips_configuration_guide.pdf
    • 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_off0000df7a.bin
08b6e3fce4c937542b259be3d8abb95bfd06a50c6beba2d5cc8098fbaa796d44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 5208 bytes
font_01_sfnt_off0000f13c.bin
2f7b6f74ad0afcd86eba20b875118880ffca4f9ed78bfe04ff603e494c0cb690		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 10332 bytes

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