Malicious PDF — malware analysis report

Static analysis result for SHA-256 8465c5233b8dd86e…

MALICIOUS

PDF

68.5 KB Created: 2021-02-12 11:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aec9c04856d571bc1315062d3ba20259 SHA-1: 322d8b3f5209442c000e618be818c32fadd2c7f0 SHA-256: 8465c5233b8dd86eb98c79021e90c027ef017565bc435ed86d6d555c839935a1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The heuristic firings indicate the PDF is designed as a link farm on disposable hosting, aiming to direct users to malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=eastern+market+metro+map In PDF document text
    • https://static.s123-cdn-static.com/uploads/4404723/normal_60096dc641b51.pdfIn PDF document text
    • https://cdn.sqhk.co/velijituma/Mjh0icD/sound_pressure_level_meter_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/GPWjeva/adobe_photoshop_fix_app.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/sjiOIeH/70917619187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_5fe8069331825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460447/normal_600ae426221c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_601b7770c05be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454677/normal_600684d5bb768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://melumudinev.epizy.com/61449388589.pdfIn PDF document text
    • http://wipidomi.rf.gd/wusezogefirewodokuvatimid.pdfIn PDF document text
    • http://bikizituluvu.epizy.com/blue_cross_blue_shield_of_michigan_forms.pdfIn PDF document text
    • http://jajojamoxarug.epizy.com/wufudumusixizesugib.pdfIn PDF document text
    • http://gonuwufif.epizy.com/zuxasapazejejedada.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/aho_girl_batch.pdfIn PDF document text
    • http://gogamezotuzapop.epizy.com/google_chrome_android_bookmarks_export.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_off0000cd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1C 4956 bytes
SHA-256: 2003ad870d61de70f1199f25b99d8e2e204c87912a78df48a919c0ad29012749
font_01_sfnt_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 11564 bytes
SHA-256: 7b65d84c7a92d97ae8dd5d02e667593cf640be61953da3ec7fb7385bc7c43d7d

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