Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1a305c97cd22aa…

MALICIOUS

PDF

73.3 KB Created: 2021-04-02 23:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 283f3c29b18f48554db4300638de5b73 SHA-1: 20d35cb975301917d4f9dedaac1670433ee56e19 SHA-256: 9a1a305c97cd22aace0503c2bd8eb2612721b62795d7745e30efad92679b8871
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm and a redirector URL, indicating a malicious intent to direct users to potentially harmful sites. The ML classifier and ClamAV detection strongly suggest malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/strik?utm_term=toyota+corolla+hatchback+2016+dimensions PDF link annotation
    • https://naranopaxak.weebly.com/uploads/1/3/4/7/134700574/5296568.pdfIn PDF document text
    • https://derovidexaw.weebly.com/uploads/1/3/1/3/131382126/tolazaxuranedaz-sekopabugokem-wifovujune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495269/normal_60129eb477e0a.pdfIn PDF document text
    • http://magexaxajatadog.getenjoyment.net/what_are_the_interview_questions_for_computer_science.pdfIn PDF document text
    • https://zasiranel.weebly.com/uploads/1/3/4/5/134507270/6fcf1f82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370284/normal_6049c9d1eed89.pdfIn PDF document text
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/kedomuxizekin.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/vonutavekip/consular_report_of_birth_abroad_israel.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_9c587d1b2b7e4d8683f529824487cdbe.pdf?index=trueIn PDF document text
    • http://bidejepeko.onlinewebshop.net/taleranaxodolefi.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/candy_camera_sticker_pack_1.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/xejonevaze.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/rojonivejux.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_91bfe19707dd4e099e25e4364ee01b6c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/spanishdict_formal_affirmative_and_negative_commands.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_0d50dea8040344e080a7745abbdb4fdd.pdf?index=trueIn PDF document text
    • http://mifedisiso.atwebpages.com/posiciones_boveda_espiritual.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/31969846137.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/dizajifajaj.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/13637230028.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/73770743130.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_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 5912 bytes
SHA-256: 5593f2f2f58de5e2c247c450297f517374fd4e9b0cc3c4564c2671bf5f10099f
font_01_sfnt_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 10740 bytes
SHA-256: db6b98ddf58575a3920127e12b74764fcd399f043ec93a2d46046b755011cf92