Malicious PDF — malware analysis report

Static analysis result for SHA-256 39312d7e40e4bbd1…

MALICIOUS

PDF

71.5 KB Created: 2021-03-31 13:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f1abb7df462266843a0975fd843ced83 SHA-1: e7c4fe1f9b4b487221127d362ddcee696d040672 SHA-256: 39312d7e40e4bbd12d7be1f58397b4b8e03d201fe961300e9bc87bb7d8041c09
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious websites or download further payloads. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/award?keyword=ballet+positions+poster+pdf PDF link annotation
    • https://cdn.sqhk.co/guzufaseba/Tjhggje/download_game_street_racing_3d_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/iifgggj/fruit_splash_mania_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/ijh4ujj/contour_glucose_meter_kit.pdfIn PDF document text
    • http://rojibitakuvekuw.scienceontheweb.net/46467979501.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448718/normal_5ff5f64080069.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fcb981611dee.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/idgii93/making_clay_pottery_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/dodipenameki/DumPhhU/47877402648.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_eb7313d91ab74a819dba0b07c2784b46.pdf?index=trueIn PDF document text
    • http://jalijoruki.atwebpages.com/27070338084.pdfIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_e0675ade32884351a4b95384f6755aec.pdf?index=trueIn PDF document text
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_535411b721ff40319463e294bbab860a.pdf?index=trueIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_744ab6dc6e29498abab9b966d4fa69d9.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_0ef382eb72134eaeb4bb1bdb60efb511.pdf?index=trueIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_19db3c2a35154d398317ca6826b5614b.pdf?index=trueIn PDF document text
    • https://2fe0a9f4-4d23-48c4-8711-d5fb25093877.filesusr.com/ugd/683a75_d620c1ff39b3483a8e0278c79f791841.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_2b63ee30363642b39652542fe6efdeb5.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_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 5084 bytes
SHA-256: 17cc59f8fa77b1a401b1663579ff55180e27253eb7faa9bc93a5a793019f0dad
font_01_sfnt_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 10496 bytes
SHA-256: ca5a66992055d247f30bb5eda5ff254b2f1072ea4947a45e6593ef8a7ae8470b