Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d1e5809ed91547…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 11:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 972a3f50443ca7d20fbf811b1c9cfa86 SHA-1: 6df5ef651b95b363a151a8a469b705168a253cff SHA-256: b7d1e5809ed91547c428a46fe7b29c2cd3e25b06921c114bc14aa983971b61fe
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with multiple embedded URLs pointing to other PDF files. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://queure.ru/uplcv?utm_term=where+to+find+qr+code+in+android
    • http://roletyhanarol.pl/files/file/gasozipirujepu.pdf
    • https://masihpt1.com/contents/files/jufiguko.pdf
    • http://nuk-amro.de/userfiles/file/46371704665.pdf
    • http://intersonik.eu/upload/files/jisaweforalezalo.pdf
    • http://abpaluso.com/upload/file/taxebinemajigopilefomapo.pdf
    • https://landbondcorten.com/attachment/file/179be8602ee054677d2937995fde4be5.pdf
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/kusujugoxape.pdf
    • http://ozdermusavirlik.net/userfiles/file/23014422382.pdf
    • http://anadolumatbaa42.com/genelresimler/file/26823613710.pdf
    • https://hotelpancharatna.com/assets/userfiles/files/walawaluronaxuzije.pdf
    • https://merohamro.com/ckfinder/userfiles/files/12143396293.pdf
    • https://eetravel.net/file/jikazaxelapajiwif.pdf
    • http://canvangdientu.com/images/file/48013118050.pdf
    • http://batterseataxi.com/survey/userfiles/files/tojenopexuvor.pdf
    • http://studiotecnicomancini.eu/userfiles/files/supovijupewivikaxexu.pdf
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/mubimuvagosikupi.pdf
    • https://hondaotohaiphong.vn/upload/files/narolodojinefapuzemeku.pdf
    • http://zenithmetals.com/files/42114361679.pdf
    • https://dollarplus98.com/images/upload/files/8733973290.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350fdb18f20---xixebexugisup.pdf
    • https://tidurmalam2.com/contents/files/bobetapujokimanufebup.pdf
    • http://machinegroup.ru/img/outer/files/jogidored.pdf
    • https://moveo-sport.pl/userfiles/file/9887193290.pdf
    • http://przyrodnik-kujawy.eu/userfiles/file/pekakanurida.pdf
    • http://majedalkarkhi.com/pics/file/685551736.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_off0000db91.bin
4fecdc1249b5c8369331b3750dc08395ae87ec602f7d40362b188ed718b2181a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 17652 bytes
font_01_sfnt_off0001096c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 16792 bytes
font_02_sfnt_off00012183.bin
167bb76ac2bfba95bc8f91d10781da48d451b85a0666a97ec075ea16b9fd8a5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12183 10496 bytes

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