Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51f814f497bb05b…

MALICIOUS

PDF

69.0 KB Created: 2021-01-12 14:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3a7aac67f56644a773cf0bf9c6ae3ce2 SHA-1: 79656f714cccdb0968f261df1a4648454431d59b SHA-256: e51f814f497bb05b4b01d6cbc06c37b10444292d912455d88e69a3d18db4cadd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to nutritional information, likely to trick users into clicking the malicious links.

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
  • 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://trafffe.ru/aws?utm_term=sweet+potato+fries+fried+nutritional+information PDF link annotation
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/7654624.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/311df431c2faac8.pdfIn PDF document text
    • https://site-1177736.mozfiles.com/files/1177736/10173966317.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459921/normal_5feb35b006586.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/poroxogutowatij-daxojopulog-gujiwavoru.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/buwepajexen-kifaputisinilok-nonafup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480886/normal_5fe6e089affa9.pdfIn PDF document text
    • https://wudonazig.weebly.com/uploads/1/3/4/6/134675044/138255.pdfIn PDF document text
    • https://koxawobe.weebly.com/uploads/1/3/4/5/134528326/sonililovizitizuwami.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/tesasubawalozan/1965710706.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/bhoothnath_return_movie_300mb.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/breaking_news_today.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/infectonator_2_unblocked_games_66.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/14643128071.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_off0000d127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD127 5380 bytes
SHA-256: c783378891d419ac4c075a21cf584f2285483410d6322226ff4d8925ccb189a1
font_01_sfnt_off0000e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 10452 bytes
SHA-256: b6216b5a4222ac4f3bc7f3fb3829137c5ebd19a356488261b15556bb98b31457

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