Malicious PDF — malware analysis report

Static analysis result for SHA-256 990a6cc8376056e6…

MALICIOUS

PDF

71.4 KB Created: 2021-09-14 11:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9bbc409d3a2c5526d0f3b840777f1a76 SHA-1: c7983d4339aee8310ad4d11870963aad62c6463b SHA-256: 990a6cc8376056e6e59a47fef0f71da82560caf6f5f40fb6ffbdfc11ca496f82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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 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 http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a30c72bee---zafewoparopu.pdf In PDF document text
    • http://dreamsurgerycn.com/ckupload/files/kovinovetemol.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/wewavogadariratipokuw.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/tobojip.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/7165231390.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/zajadegirusajolovefe.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/79154569169.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/jerezuwewak.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/87027761081.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/punewavikenirinuwel.pdfIn PDF document text
    • http://airmon.hu/images/files/66995624632.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/58951531292.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/tirivufelakata.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/sanukopofele.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/wunonaxeliloxitobe.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/30171992918.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/ripowitanapagumumatufaj.pdfIn PDF document text
    • http://tzsunup.com/upload/85569677366.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/waxexejetelafutivevuf.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/25976747272.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd51d61215---48720053239.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/59996131517.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/zemarag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sms+filter+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD050 15720 bytes
SHA-256: 64bb95ca4d7e8a4371fec24f7032c31e5367af2636574771a20df92b6351206b
font_02_sfnt_off0000f7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 10588 bytes
SHA-256: ac9420fc5ef481dcda064cca99a49c94f38af893400d875b62652c4f185058cc

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