Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2eea55cc975c80a…

MALICIOUS

PDF

75.6 KB Created: 2021-01-13 23:56:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 896151a0a6507f411e1dcc0305e6ba73 SHA-1: dbc0b0d7d6e01aa15e6e3f21e40ed099eeda76ae SHA-256: a2eea55cc975c80aea358c802fa1e729e56c4e31d4fd10f33cecf0378f63e069
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting or redirectors, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the interpretation of a link farm designed to obscure malicious destinations.

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://trafftec.ru/123?utm_term=packard+bell+computer+1995 PDF link annotation
    • https://site-1178858.mozfiles.com/files/1178858/winkawaks_1__65_rom.pdfIn PDF document text
    • https://site-1174888.mozfiles.com/files/1174888/audacity_latest_version_2015_free.pdfIn PDF document text
    • https://site-1211946.mozfiles.com/files/1211946/nike_zoom_road_racing_shoes.pdfIn PDF document text
    • https://site-1171954.mozfiles.com/files/1171954/zosapuwisurufajewaki.pdfIn PDF document text
    • https://fevokixesebu.weebly.com/uploads/1/3/0/7/130776230/3510575.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/9f94b.pdfIn PDF document text
    • https://cdn.sqhk.co/datagemop/gjNTjd9/rocket_sky_unlimited_game.pdfIn PDF document text
    • https://site-1176302.mozfiles.com/files/1176302/39781195229.pdfIn PDF document text
    • https://site-1174218.mozfiles.com/files/1174218/86222321084.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470985/normal_5fefbfdb45f32.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/bokofapig/pixar_movies_fight_list_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/79981996087.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_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 5580 bytes
SHA-256: 332ac905cfa1f2ce3c2157ce9bd6f55f13b0aadbbd9217061d0fa6eba10b21f5
font_01_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 11588 bytes
SHA-256: e139fe83b0e0e544572055f67651474954baeaa5c32f1084b5a04731bf216c93

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