Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d69d2009bd5a3c…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 22:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1397b9270b312595420df85c202142e6 SHA-1: 73897b751f2fc85cf3bc06d4619e14c2d19d8447 SHA-256: c1d69d2009bd5a3cc5972d349221418b063007b60ed57094710e7ae8b7f3a260
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a strong phishing or malware distribution intent. The authoring application 'wkhtmltopdf' suggests the PDF was generated programmatically, likely to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://medvor.ru/uplcv?utm_term=excel+vba+export+pdf PDF link annotation
    • http://haki.vn/uploads/files/tipusubudefubogokenodib.pdfIn PDF document text
    • http://p-energo.ru/content/file/76657440808.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/lukokugeduruvifoganis.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/39180468552.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/pinixipuxopudasetuliragoz.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/kugam.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/nizawozawulije.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/47222029480.pdfIn PDF document text
    • http://zerosquareonline.com/file/8567125694.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/65295722080.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/35155045488.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613352e701427---xidijamavunabanu.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/80324674028.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/nirokijagadomimubunakiw.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/dumefirujumupakija.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/kaladaxunubezim.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/kobumoda.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/59714557174.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/98951842581.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/vupiwawumiredokefa.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://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_off0000c161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC161 17484 bytes
SHA-256: 410888ae8099571158c4e35e99d186496dc12aebc94489c05c14e059f72e6669
font_01_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 10540 bytes
SHA-256: d6cbed41673e3e2754980bb12cea1e99ffc71f0a3c11c9ed775afe0098fd3135
font_02_sfnt_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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