Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d0ea7c56a460bac…

MALICIOUS

PDF

81.5 KB Created: 2021-03-10 00:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c613f7da98a832f717a5dccc4c133fe6 SHA-1: c17355d6d125ec723db880670bb61f3e2c5ceea9 SHA-256: 3d0ea7c56a460bac07aa33961c04c0bb789ef1c552d6a4acaad89dee86d27679
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://pelibifir.ru/123?utm_term=amadeus+movie+notes+worksheet+answers PDF link annotation
    • http://cloudmarket.website/vulamotititurotozojasesal7870i.pdfIn PDF document text
    • http://devgame.design/was_there_really_a_disappointments_roomm718n.pdfIn PDF document text
    • http://endi-itali.space/xivubejavokwtfq2.pdfIn PDF document text
    • http://presentinsta.online/tascam_portastudio_424_mkiii_forumsq9onv.pdfIn PDF document text
    • http://taher-tcac.com/what_is_ap_stylebookkib4z.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/fonuxugarumoroduj1ez56.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/wunojajet.pdfIn PDF document text
    • http://perfectiona.online/kuwexopebejederesagissqnf.pdfIn PDF document text
    • http://airet.space/wodureb1bmgx.pdfIn PDF document text
    • https://bonadamoge.weebly.com/uploads/1/3/4/0/134000068/8205182.pdfIn PDF document text
    • https://rabibenexu.weebly.com/uploads/1/3/5/3/135319922/12114faefba72.pdfIn PDF document text
    • http://shoop-fl.ru/88485281802al8ea.pdfIn PDF document text
    • https://tozafutesaf.weebly.com/uploads/1/3/4/9/134900259/4110913.pdfIn PDF document text
    • http://bluetea.space/puvubosetpowrj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_f5bc315c9c3047a0b91d57b848728c2e.pdf?index=trueIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_0a58a404f4e140e887c3d4b4adddca05.pdf?index=trueIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_e451793a65bb452b8a7005e8aea9f611.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_65eb0f18eabc42afacc810e6a1c43506.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwafo/44210711600.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/aarum_kaanathe_aarum_ariyathe_lyrics.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_58d77a9efc7e42c2a88e42c8c675d292.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_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 5236 bytes
SHA-256: 5cf3cf3136303da7bccdc159b4cb732c2d18e18857f9eca2d5dcdb1c46267846
font_01_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 10560 bytes
SHA-256: 0bcf59eae0f5516e5f71b479550738ba96067cb44ddf09e9ddc9f51513deea11

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