Malicious PDF — malware analysis report

Static analysis result for SHA-256 49be997385da042b…

MALICIOUS

PDF

75.8 KB Created: 2021-01-19 17:29:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 581758a7494d033e33d9a638c51da3cb SHA-1: b3e1ac36994e18be35db4cbeb4358b9a0b7216f6 SHA-256: 49be997385da042bb389f7f0fffc8b1ecc9077c77aa8c0f475f2d43da81855b9
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, and contains numerous embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/aws?utm_term=organic+cotton+flannel+crib+sheet'. The document body is heavily obfuscated, but the presence of many links suggests a phishing or malware distribution attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=organic+cotton+flannel+crib+sheet
    • https://letolonenuxe.weebly.com/uploads/1/3/4/0/134095956/83dedcace33c.pdf
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5fdc07a688baa.pdf
    • https://site-1177610.mozfiles.com/files/1177610/45770704940.pdf
    • https://site-1177846.mozfiles.com/files/1177846/redstone_guide_book.pdf
    • https://site-1247770.mozfiles.com/files/1247770/pertussis_diagnosis.pdf
    • https://site-1178114.mozfiles.com/files/1178114/photo_collage_maker_app_download_for_pc.pdf
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/1c9fc92d.pdf
    • https://cdn-cms.f-static.net/uploads/4413244/normal_5f9b2cd4c1aca.pdf
    • https://rebageronamit.weebly.com/uploads/1/3/0/7/130775484/3a35f6.pdf
    • https://cdn-cms.f-static.net/uploads/4500453/normal_5fd195cd29f60.pdf
    • https://zedaluridafam.weebly.com/uploads/1/3/4/4/134464222/7841274.pdf
    • https://site-1246001.mozfiles.com/files/1246001/92468429228.pdf
    • https://static.s123-cdn-static.com/uploads/4409113/normal_5fcd3b13274a4.pdf
    • https://kalepadakib.weebly.com/uploads/1/3/1/6/131637037/duzoxejulatavi.pdf
    • https://static.s123-cdn-static.com/uploads/4491173/normal_5fed164ce488b.pdf
    • https://site-1174356.mozfiles.com/files/1174356/bluetooth_for_pc_app.pdf
    • https://site-1215606.mozfiles.com/files/1215606/64196268283.pdf
    • https://static.s123-cdn-static.com/uploads/4490370/normal_5ff9df0634021.pdf
    • https://static.s123-cdn-static.com/uploads/4418987/normal_5ff035a2f1d78.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_off0000ea0a.bin
8334959a76ef8f6ed9c7828b56588bd3d1c85f686b039ee91ca55f6138c2397a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0A 5308 bytes
font_01_sfnt_off0000fc16.bin
7068c36ab638db55294d30ad8c4155f1350647c9af43789c25e2919a385f9640		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 11124 bytes

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