Malicious PDF — malware analysis report

Static analysis result for SHA-256 81232c7ae6ea8db8…

MALICIOUS

PDF

70.8 KB Created: 2021-09-19 22:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f1173363264996393f3220d481df3cb SHA-1: 3a9f85a5ecd5ac7115397d53e06b452ffcba1489 SHA-256: 81232c7ae6ea8db82c69366916e8b80e1adf4d8378070a341e243dd16ecf819a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. Heuristics indicate this is a phishing or malware distribution attempt, with ClamAV specifically flagging it as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The file likely serves as a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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 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://pasaru.com/upload/files/mujevokalabe.pdf
    • https://path.mn/userfiles/files/47439231434.pdf
    • http://gloria-eurex.com/images/blog/file/kawagusuxijitubalibatag.pdf
    • http://bbmeti.it/userfiles/files/31872366599.pdf
    • http://studiolegaletrotta.eu/userfiles/files/65307039573.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/jezug.pdf
    • http://infinity8talents.com/userfiles/file/4459323804.pdf
    • http://kozelsk-adm.ru/files/uploads/files/50611141831.pdf
    • https://menu2uplus.com/images/file/85964120752.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/ramisabapujipawe.pdf
    • http://binhchuachay.info/Images_upload/files/22729960464.pdf
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/rufelovegameduv.pdf
    • http://fine-trading-knotwork.de/uploads/media/37309754265.pdf
    • https://mobspace.xyz/web/img/podborky/files/70598803777.pdf
    • https://dienlanhhonganh.com/images/pic/file/6496317890.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320a1ab3efb---50032981662.pdf
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/35679744697.pdf
    • https://tennis-samara.ru/img/file/zigof.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/sisilu.pdf
    • https://mmrh.myagenda.cz/pictures/editor/files/2281529541.pdf
    • http://ehomerealestate.org/images/file/3708631693.pdf
    • http://frickcontrols.com/uploads/files/53687829797.pdf
    • https://nanyangtextile.com/userfiles/file/66903338220.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadf869327---rinapusikebabixorozugonaw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=naruto+fight+shadow+blade+x+apk
    • 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_off0000b513.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB513 16792 bytes
font_01_sfnt_off0000cd25.bin
d17934f39a595cafaba9d9d88b9df008b384b3a135409106faef68257db31abd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD25 15044 bytes
font_02_sfnt_off0000f34f.bin
ee28555151184fa011471f72924537c826507e1aeb320aa55a70f3bf7b69e011		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 11168 bytes

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