Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d11a178b644304…

MALICIOUS

PDF

78.4 KB Created: 2021-03-30 23:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3b979260006b15a3e9f370b6adebf860 SHA-1: 377d7277790dc89a1209e132ff8aaaf944c8958f SHA-256: b9d11a178b644304faa0a542380dbf009051c86cfc867bc1af35fd86a46dbd18
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for SEO manipulation or to distribute further malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and potential use as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/award?keyword=how+to+learn+fluent+english+pdf PDF link annotation
    • https://nafipitomaw.weebly.com/uploads/1/3/5/3/135349771/94264f8deb.pdfIn PDF document text
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/lesud_sajev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486368/normal_604af968e949b.pdfIn PDF document text
    • https://bolamowoxuwev.weebly.com/uploads/1/3/3/9/133997192/wupisifativupenujap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379233/normal_605c758b04fce.pdfIn PDF document text
    • http://busumewum.22web.org/graph_the_parabola_yx-423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_604898371f33a.pdfIn PDF document text
    • http://doxisolawasusig.66ghz.com/chokher_bali_video_song.pdfIn PDF document text
    • http://kifenefazujiz.iblogger.org/32862847759.pdfIn PDF document text
    • https://detaxenenikub.weebly.com/uploads/1/3/0/7/130776267/a49e6.pdfIn PDF document text
    • http://mukesuzovuvo.22web.org/the_book_of_thomas_the_contender.pdfIn PDF document text
    • https://sobomevoza.weebly.com/uploads/1/3/0/7/130739746/murekukakudu-newevi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_e31cc60cdd9d499cb7024423900752a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2431d6cb-143a-4bc1-bd4d-2a1d00ce4cb7/nurekewalitefubutijugutik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4ca7c8-ba31-484e-a43b-bb7828aaedb7/philips_norelco_sensotouch_3d_1260x_replacement_head.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d58899-4c36-411d-a183-3a8b956bd7ed/wirigusorevodofok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af93a427-e71b-43b7-b508-d4cec992f992/10953194471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/570c4c82-861c-4232-9c53-ca08e5ac1664/multiplying_exponents_fractions_calculator.pdfIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_ff6e6fd9bd0746df8fdfe03425afdd05.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_b8b14b84117c445da185c70d1b7e478a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e6b5eaf-83ab-4d85-9794-fc48e256dce5/how_to_join_pin_loom_squares.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9fa903-a136-4733-8705-eeba40b2fe6c/how_does_garmin_golf_watch_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ad6c46-4154-4268-953e-8933c4fd87d8/salen_and_zimmerman_rules_of_play.pdfIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_0b763c61c12d4781adde2e61be2961e5.pdf?index=trueIn 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_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 5356 bytes
SHA-256: 34cf79919e1d73352e047c9621090927c11d68679e1cd9a6f7533bcd0fb0f778
font_01_sfnt_off00010777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 10588 bytes
SHA-256: a57705900e88ff22905a8669b4d99f88c820101b7fbe7a8654bd07c03b23d9e3

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