Malicious PDF — malware analysis report

Static analysis result for SHA-256 078dd5cd2e4df84a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 03:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0875c8a4b6aeaa5452541c47b235b71 SHA-1: 3957dc9b25af09faecd22b8abfbe10cbabdc3ef6 SHA-256: 078dd5cd2e4df84ab414c64c519c39007abb99e92fcc30f95d9aca3ae209d913
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a high heuristic firing indicating a link to an algorithmically generated URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://newshop.jp/archive/file/6407752960.pdf
    • https://ilonew.tasksplan.com/userfiles/files/fibud.pdf
    • http://hoteldarim.ir/basefile/hoteldarimir/files/govebata.pdf
    • http://ff-engineering.com/userfiles/files/36485113551.pdf
    • https://tivicom.vn/upload/files/fitemotiga.pdf
    • http://a-b-i-s.net/layout/bilder/file/80875143865.pdf
    • https://makojudo.pl/zdjecia/fck/file/faxitofaruzazesubikafobo.pdf
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/kelojadu.pdf
    • https://ccichn.vn/data/upload/file/73835914931.pdf
    • http://mediedil.eu/userfiles/files/78723955284.pdf
    • http://devveb.net/userfiles/file/27067577517.pdf
    • https://emailing-online.fr/uploads/userfiles/file/lunijanofugazak.pdf
    • https://classconnbio.com/img-jacson/files/xizetalupikilogiwabifamon.pdf
    • http://danieldesignpro.com/userfiles/35998366971.pdf
    • http://metall-press.ru/files/96986257450.pdf
    • http://cloverdiamond.com/file/79265412805.pdf
    • http://retrievers.su/ckfinder/userfiles/files/gufewaziriwusi.pdf
    • http://aktifbant.com/resimler/files/69342146099.pdf
    • http://podlahyadvere.sk/editor_uploads/system/files/74263588912.pdf
    • http://www.binghan.my/userfiles/file/voxirumuzoxaganegedijig.pdf
    • http://bbhshipyard.com/userfiles/file/88737843419.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331b30b9370---30670622235.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/49825922910.pdf
    • http://tfforming.ru/d/files/46881851873.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mobile+cricket+live+watch
    • 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_off0000af6e.bin
3b1fee61f7efcf5cf7e730c30c94204ff9600b144783e7c659c4e0b5acf46779		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6E 16684 bytes
font_01_sfnt_off0000d9f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 16792 bytes
font_02_sfnt_off0000f20b.bin
b47301629384065e07bf4eb766cd453fe0c14d7891a59ff8b243b86f3fe89ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 10432 bytes

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