Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac795ea0dbd8fa2d…

MALICIOUS

PDF

70.2 KB Created: 2021-10-03 13:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22b238c3ced1678576edf4e35711f373 SHA-1: 8b14fc499aeeb2d0c3d1bdd21fec7fe3cf19ec49 SHA-256: ac795ea0dbd8fa2df0936b4f00792e6612996e439368f3aa2c9e554636e85e5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it functions as a link farm on disposable hosting. Numerous external URLs are embedded, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URIs point towards an attempt to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://infrive.ru/uplcv?utm_term=orange+roan+english+cocker+spaniel+puppies+for+sale
    • http://namhungholdings.com/uploads/ckfinder/files/banipevemira.pdf
    • http://xn--aknmedical-yub.com/uploads/file/27613764801.pdf
    • https://yoimart.com/upload/file/20210913195349.pdf
    • http://lotusburbank.com/uploads/files/zigunadoz.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/87971218330.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/bofexemazisenopexumufox.pdf
    • http://lamay.de/userfiles/file/guwimikulisamig.pdf
    • http://cascinamana.it/userfiles/file/86546264726.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/jepada.pdf
    • http://polaryachtmanufactory.com/res/wysiwyg/file/kexeninov.pdf
    • http://hyeminshop.com/DATA/files/15465063742.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161501a410bc4e---betetiwizo.pdf
    • https://hanomanberjaya.com/contents/files/23909342645.pdf
    • https://libertyrealestate.in/ckfinder/userfiles/files/nuburomumijawalukubetoro.pdf
    • http://clubesquilacoma.com/uploads/files/xitexifuribafen.pdf
    • https://fnb-concepts.com/images/uploads/files/penujilefoladejuruta.pdf
    • http://uk-finansist.ru/userfiles/file/vigeludedep.pdf
    • http://cdn.eagle.mn/uploads/userfiles/files/2223232795.pdf
    • http://wills-machine.com/UploadFile/file/tisuzuwibawinujixefegugew.pdf
    • https://anup.bo/images/files/49017313805.pdf
    • http://tubelessons.net/cms_images/file/67154076174.pdf
    • http://urgentcarepb.net/userfiles/file/75972566166.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/fekujufajobo.pdf
    • https://venusnvs.com/userfiles/file/70267468125.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_off0000ae5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5D 16792 bytes
font_01_sfnt_off0000c66f.bin
521af8d36f7551405a61d7c4b91c9668156684f683258fb23ba13a026962b9d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC66F 16276 bytes
font_02_sfnt_off0000f017.bin
aa81e95e1bc9d29e1aaf8964d6c9291209735307ab1591af1cbd91f04947f0d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 10880 bytes

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