Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd774ad1546469e2…

MALICIOUS

PDF

86.0 KB Created: 2021-01-16 15:32:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6319b0c991579097b94a0c8c67cb182d SHA-1: 3ef59bebbbb91a164d7c239dff2cb42e27430cb0 SHA-256: dd774ad1546469e2a8617b866c257c2b0212c5b3d44c831e419b544ab83fe0c8
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host and deliver malicious links. No scripts were extracted, but the presence of multiple links to disposable hosting and redirectors strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/square?utm_term=s3+bucket+cloudformation+name In PDF document text
    • https://site-1221616.mozfiles.com/files/1221616/gridded_paper_template.pdfIn PDF document text
    • https://sadibagisu.weebly.com/uploads/1/3/4/7/134758630/98429da0b2a.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/votuzulogi_kuwevuzazifudo_gekajapover.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/eehajfH/photo_collage_app_download_uptodown.pdfIn PDF document text
    • https://site-1174463.mozfiles.com/files/1174463/69471541452.pdfIn PDF document text
    • https://cdn.sqhk.co/xewasejeve/hiqGjjr/3_way_stack_switch_leviton.pdfIn PDF document text
    • https://cdn.sqhk.co/mozedizupi/ggjGKwW/dots_and_boxes_game_multiplayer.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/kimazidamufixibe.pdfIn PDF document text
    • https://site-1176713.mozfiles.com/files/1176713/15447260928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382782/normal_5fd142bc9c207.pdfIn PDF document text
    • https://site-1174504.mozfiles.com/files/1174504/technical_specification_of_transformer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001129e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129E 5460 bytes
SHA-256: 60cc90f5e144ad8b641202805d69cd11e1eab84d1180e188aeeba85cdc75f69b
font_01_sfnt_off0001251d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251D 11612 bytes
SHA-256: 177458961d580757b602bc7fea61d8785a86ce889e18dceb62f73c6d790ade4e

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