Malicious PDF — malware analysis report

Static analysis result for SHA-256 4441246484569fbe…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 16:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 393600ac88c99c1fe2d1d8f5b21bd235 SHA-1: 121b48d90ceca2c5c7d68ad570c2eaa1b71b3c6d SHA-256: 4441246484569fbef7cd99f3f25569cfd833e2daa6702e0a620de5ea3c0dd0eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://dkstores.gr/userfiles/file/18879951497.pdf In PDF document text
    • https://cgeminfos.ma/upload/file/2473386555.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/buwukevuzabejinew.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/lulevim.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0e3cb3b10---87244403109.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/27680929988.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/53601381048.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da0d681a1---53853485265.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/nolawobexujefubadovuwozu.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/54884157751.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/73957278700.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/30805433157.pdfIn PDF document text
    • https://wineart.online/userfiles/file/gegagesik.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/nolaz.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/28796468411.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/40450841955.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/42333017274.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/delodajok.pdfIn PDF document text
    • http://salwex.hu/file/zobatevulomijesup.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/394682377.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/xawuxinix.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/jelolusakuvojurizexikafo.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/pemoweni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=set+it+off+full+movie+download+mp4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 17576 bytes
SHA-256: 5dcb74ad20695e4404c5d40dd24d77c97d6cc5152e993a22cc25a401999bc9da
font_02_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 10796 bytes
SHA-256: a0e098c16cba96a1a4a6bdc9ffc846c49a23c954c548dd645201fd2e3a53b0ed

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