Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e3fb4b4e82645e…

MALICIOUS

PDF

90.3 KB Created: 2021-03-08 15:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 66d91ab49ce20b3a97d940884dc6d688 SHA-1: 09a034dad99da3e74c583372b7c84c51e7cf75cb SHA-256: c2e3fb4b4e82645ea323c65045341eacc0ea3dc111ab648957107e092d389dbf
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to known malicious redirectors or disposable hosting. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to harmful sites. The ML classifier and ClamAV detection further confirm the malicious nature of the file, suggesting it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=french+and+raven+bases+of+power+pdf In PDF document text
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/lutoxip-jidibu-kukomi.pdfIn PDF document text
    • http://shopwithsale.website/pugimubakobowedumunmob7u.pdfIn PDF document text
    • https://lupipoga.weebly.com/uploads/1/3/4/4/134402738/aba92b8.pdfIn PDF document text
    • http://slampochka.ru/unit_atomic_structure_ions-_ws_3_answer_keyhc0ea.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/pepar.pdfIn PDF document text
    • http://itawegan.space/vorexolosisojorokidue408.pdfIn PDF document text
    • http://frontglass.xyz/wamonenuxugaxewidezubodwg8u.pdfIn PDF document text
    • http://phrensy.co/human_fall_flat_xbox_walkthroughwq4az.pdfIn PDF document text
    • https://kaketoxemi.weebly.com/uploads/1/3/5/9/135989659/3601497.pdfIn PDF document text
    • http://woodlesenka.ru/sufoxusanodunowovofe6m40t.pdfIn PDF document text
    • http://premiumpornclips.com/how_much_does_a_plastic_spoon_weighuuium.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/47b024b1-bae6-4efe-a773-d1b08a991008/76142870862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a7b0d8-07be-4cc5-97e0-3d27d91bede0/how_long_to_learn_guitar_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08139477-d198-4f8c-85f7-ee7cd3d30583/ap_1_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4f14e87-6615-47bd-878e-927f3a16717e/bloodshot_eyes_meme.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 5116 bytes
SHA-256: 7e349b0549c24ff6c87e652a5e627ac862816be3baf87c861169dae75c4a544f
font_01_sfnt_off000126a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A9 12376 bytes
SHA-256: 4ac53ff12f06c6148a09f24cdb5bdba5fd1e4d12f95735222c63a8f56971eea7
font_02_sfnt_off00014e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E42 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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