Malicious PDF — malware analysis report

Static analysis result for SHA-256 a941689e337b62b1…

MALICIOUS

PDF

68.1 KB Created: 2021-10-03 17:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e487a12b676206ae4d0c153dd2635d1 SHA-1: de92c604760cb4d1993492cb5265c6cefe9091c3 SHA-256: a941689e337b62b1680e3ccf635271557716d46bd44eb763cd15b4a7248534f4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-only with a click-outward action and a small file size. It contains numerous external URIs hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate a phishing attack or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://oniceh.ru/uplcv?utm_term=chicken+fat+saturated+or+unsaturated
    • https://bustotoronto.com/userfiles/file/mixadolukibowuxajawisoje.pdf
    • http://rm-centr.ru/uploads/file/tejega.pdf
    • https://a-guskov.ru/uploads/files/16252456749.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9d8358069---savamewu.pdf
    • http://topoint.net/userfiles/fckFile/20210929103714.pdf
    • https://manorhair.com/uploads/files/202109140209447961.pdf
    • http://sanalights.com/admin/admin/uploadfiles/file/bapudu.pdf
    • https://bangvetthuong.com/luutru/files/nakif.pdf
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/xesefizarogajakelinez.pdf
    • https://hoya.mobioptika.hr/UserFiles/file/42589650907.pdf
    • http://qianxi.cn/filespath/files/20211001072355.pdf
    • http://brette-animation.com/userfiles/file/8154785058.pdf
    • http://pkynfe.net/userfiles/file/53817199909.pdf
    • https://0922.sproname.com/files/userfiles/files/mopijalal.pdf
    • http://dalaichau.com/files/suluxilelevugewajobepulon.pdf
    • http://ssatripoli.org/userfiles/file/20276695735.pdf
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/wuziratupofamuposadevada.pdf
    • http://wskinbody.com/data/boardData/files/47125360506.pdf
    • https://m-isc.com/userfiles/file/siwadab.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150b4ac38840---pofudaxodasi.pdf
    • http://humanlitech.com/files/files/96131526794.pdf
    • http://autolavaggiocraparotta.it/userfiles/files/96054416901.pdf
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/daxemanonelu.pdf
    • http://lamexmarket.com/uploads/files/20687147397.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeeb.bin
9ab755086cbc1ef947390fe55ada3705a1bee12f0987264bf93f67b34eff7990		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEB 14020 bytes
font_01_sfnt_off0000d203.bin
787ca87027f72d8d4041220f2713d36b31c4a39cbb705ccc73dab26f83763661		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD203 10748 bytes
font_02_sfnt_off0000eac3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 16792 bytes

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