Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90869df8e7e1d4b…

MALICIOUS

PDF

81.2 KB Created: 2021-03-28 04:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c8bfa4c3546c8f931a2b6c99082512cd SHA-1: 018b22e2d0fc5ab3a85be2c96dffe0319745d511 SHA-256: f90869df8e7e1d4bc1628d637bb71a22e06b32ae162dcec37d3d519a7029a8e7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection techniques.

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
  • 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.
  • 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://lozipotod.ru/award?keyword=electronics+workbench+tutorial+pdf PDF link annotation
    • http://gufolosolikivu.22web.org/frontline_commando_mod_apk_d_day.pdfIn PDF document text
    • http://it50disconto.info/mercruiser_4.3_engine_oil02ixy.pdfIn PDF document text
    • https://zafubunemajuz.weebly.com/uploads/1/3/5/3/135314528/8520336.pdfIn PDF document text
    • http://panokaluwavivar.iblogger.org/twilight_saga_new_moon_vinyl_record.pdfIn PDF document text
    • http://xenotobewaf.22web.org/detinirelafodefipovami.pdfIn PDF document text
    • http://meetplafond.xyz/montessori_flags_of_the_world_printableielu0.pdfIn PDF document text
    • http://zowutelufuga.iblogger.org/pilazotokokezomow.pdfIn PDF document text
    • https://tarezusubem.weebly.com/uploads/1/3/5/3/135386237/293861.pdfIn PDF document text
    • http://idealica-italiauficiale.website/stumbled_upon_meaning2cjsw.pdfIn PDF document text
    • http://pankreatitum.ru/futodoxivedumuw54bvk.pdfIn PDF document text
    • http://rankingcoach-apps.com/sisebekefatagibafefesifazc0hm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fezekugagow.rf.gd/pakupivuxifomivid.pdfIn PDF document text
    • http://tejajageduvutu.epizy.com/49714865512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec574317-0934-4300-a4df-f6ea17ade6a0/26091395442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31564de-af35-41c1-b9f1-70bbe88a4370/what_is_the_appraisal_process_in_archives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1568f70-360c-416a-89ac-7a75fd8f74ac/28659456668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1cc11aa-2bcd-4dd2-8df5-291b144c0594/tetatuvanejogositerivuxil.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 5496 bytes
SHA-256: 41cbdd3298cdfc8ceef1c374472b6fc0cee321d7b2bc5634de0b7ac11d4169a6
font_01_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 10384 bytes
SHA-256: 111733c74a4835ff01968153551ae4ad36da3c3fdd3225f28bf514ee862ef8b2
font_02_sfnt_off00012266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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