Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7ffcc9e83d4e44…

MALICIOUS

PDF

79.3 KB Created: 2021-03-18 17:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9737b864018383cc560d9540cd1989e4 SHA-1: 246033e5c3247d4c08094697674062916a897ab4 SHA-256: 8b7ffcc9e83d4e44015545eda2c6dc1e27bc62376d126a97b6d7e1e3fbafe694
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to link farms and redirectors, with at least one URL identified as a known malicious redirector. The PDF structure and embedded links suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=cours+d+assurance+automobile+pdf In PDF document text
    • http://woxijakuzadajew.getenjoyment.net/how_much_are_nintendo_ds_lite_worth.pdfIn PDF document text
    • https://duvefotod.weebly.com/uploads/1/3/1/3/131380754/lotusonugimekavese.pdfIn PDF document text
    • http://zagavexakagin.mypressonline.com/44611387371.pdfIn PDF document text
    • http://jivavesomuviz.getenjoyment.net/strategic_communication.pdfIn PDF document text
    • https://wejitefokok.weebly.com/uploads/1/3/1/1/131164199/3475692.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_ce002c508a194f36b701f383e9ae6db2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/76944782849.pdfIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_434167982e6b4e04aefb47976a7c466a.pdf?index=trueIn PDF document text
    • https://b147a2f3-58af-4013-9def-597e86e94513.filesusr.com/ugd/47d6bb_477519ed9ea7416c88c7e7a497fbaa1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae5ba9f7-6be0-4308-afec-8d97a9c2d7f2/20992752092.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_3fa5fe09a1474e5e87dd70e99f505ada.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/jugunopexunudoxaturamagip.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_02954fdecdda4cad8df546693bf4cd2e.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_804181ce0f534573ad41a9374214b990.pdf?index=trueIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_6c98ccbb06234c9297565103af80b590.pdf?index=trueIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_e228ea12c9bb40108aa199bc0bfb5d1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/defujo/tuba_concerto_edward_gregson_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/817279bc-b696-44e5-9a99-1fb77d5b255e/planet_fitness_customer_care_contact_number.pdfIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_f70249c542ad4fee80c50d0f43579038.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/moxevovanepedabuvoli.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_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 5344 bytes
SHA-256: 4f53b7a4cdb911b26db8368182c6b2c5523e191eba8c18bf9c5d5a27bd4cee61
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 12628 bytes
SHA-256: 96a4f00c57715030d3a253adb8097d7b4a83709b215a2214d740d956140e6316

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