Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc75d35893601ec3…

MALICIOUS

PDF

96.2 KB Created: 2021-05-24 09:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 32887acdc85920a47d201854eb3c5bb8 SHA-1: 12cbad25047e041d3714fe35588a88aa1c6cecd9 SHA-256: fc75d35893601ec32bcc47ec09fff9915a80ba05519bb7a242ca96b9e949ba1b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or SEO spam. The embedded URLs suggest an attempt to redirect users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.NoRobot072157-9875414-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.NoRobot072157-9875414-0
  • 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://botokaw.ru/wb?keyword=uv-5r%20car%20antenna PDF link annotation
    • https://vipuwajaziw.weebly.com/uploads/1/3/5/3/135398090/mosirabibaz-daruro-jometogele-vumexomero.pdfIn PDF document text
    • https://digikugububim.weebly.com/uploads/1/3/0/7/130774990/ladejovisowab.pdfIn PDF document text
    • https://najijufo.weebly.com/uploads/1/3/4/7/134714833/lolasa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_601838398d7dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_6047584e3c6b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_6050ef45367fa.pdfIn PDF document text
    • https://kegovivaxik.weebly.com/uploads/1/3/4/5/134506491/940f95359c9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_605054964ec97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492278/normal_606e7548db3d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502721/normal_5fd043b3a2182.pdfIn PDF document text
    • https://dugaposiga.weebly.com/uploads/1/3/4/8/134857723/7645748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500911/normal_5fda614dc0eb9.pdfIn PDF document text
    • https://kabijibijeg.weebly.com/uploads/1/3/4/9/134900291/e5846b.pdfIn PDF document text
    • https://kovajokuluvemu.weebly.com/uploads/1/3/5/3/135335912/1341640.pdfIn PDF document text
    • https://zekawumili.weebly.com/uploads/1/3/4/4/134403966/kolape-sesanujupapefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_6015dabf0bfd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_603697dd17eba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8797a4ac-3f56-4fac-8c64-dc07b0cf6902/97762862945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0c6a6eb-73bc-463d-8cd0-0ea94e9e1169/nipogadinigetoxazebel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd18a454-0a7f-44a1-a864-5398e2742da7/law_of_torts_notes_in_kannada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69960adc-1815-4e63-9e61-db0a06e3cbfb/how_much_does_enterprise_car_club_cost.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 4420 bytes
SHA-256: cd09e91db181899939f7097f240248811707008dabcfc195790e893692ffa362
font_01_sfnt_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 11236 bytes
SHA-256: 3940b3336f916821bfd4465a727ad5212bb630b6bc72f9d4b70d824b6ae752b0
font_02_sfnt_off0001502c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502C 16204 bytes
SHA-256: f04fb96856fa86c99babb5bf309615b780632e07d2318923ed038a7bfd4fd4ce
font_03_sfnt_off0001655a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1655A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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