Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1cea34cbc4d4f4…

MALICIOUS

PDF

80.5 KB Created: 2021-03-07 03:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0c94d8c72278d1fd9ad3cf8e29f29951 SHA-1: 7d0c18bb2f7edb662a0d6063361e6b56a3ccaeca SHA-256: da1cea34cbc4d4f49122ff483996dfc2605725cab6f3701271aba1208b5b3b42
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to other PDF documents hosted on various domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of external links and the overall structure indicate a phishing or SEO spam campaign.

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://gimoguvi.ru/wix?keyword=skyrim+onmund%2527s+request+find+the+staff+for+enthir PDF link annotation
    • https://cdn.sqhk.co/dasofuduveje/jfThjSK/73580943756.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/modazebisotoewoqe.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/jW9VjcD/driving_road_signs_and_their_meanings.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/thdhbif/zibixafexokufekekerebol.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/5Uk1vib/taxokoribur.pdfIn PDF document text
    • http://winsl.space/50461694139d36o0.pdfIn PDF document text
    • http://gravkamen.ru/makudelewekkltwj.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/uheXgik/digicel_top_up_app_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/2cwGQjd/cut_the_grass_league_of_legends.pdfIn PDF document text
    • http://speak4pro.com/libro_de_educacion_fisica_1_bachillerato_teidewt46o.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/hgjiaNO/jowavafonufotejobezejimek.pdfIn PDF document text
    • http://businessoutsourcing.org/rv_parky_for_pcl7kec.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/297d6489-14f1-4890-b497-109d3497190c/pelutore.pdfIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_73f8727bd6bb42138a6d330c15a483f6.pdf?index=trueIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_af5ce717c01b47c8a00c8538a6f880f3.pdf?index=trueIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_b4a464fbf9624e438e30c0c12ec1469d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2b2b08-6136-47cf-aa86-1a1ed6df901f/best_college_for_interior_designing_in_delhi.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_eaca2b4b8d2d472abcd2eac3378f6010.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_0a4f07f7919444f0807c024919c12482.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 5428 bytes
SHA-256: e62b9485f8d98f3c0ceac7826f8f3b02521ae3988efa10f7b476b50f9e58c8c6
font_01_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 10108 bytes
SHA-256: c92e9305ea7159fa1b4f6c9d18ae65e6dbc0ffbe040e9e32c5f41b44c25963cf
font_02_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333