Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabd31868a58cc16…

MALICIOUS

PDF

84.8 KB Created: 2021-09-22 13:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2608bcba0c40d7bd435f02e07ac135cd SHA-1: 55cf69c2e0f63fd0a86f947fc84d178cc4113456 SHA-256: cabd31868a58cc16bad4f7ec566fba18efd4983c16dbdeeb06d613348f5e83aa
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 are hosted on suspicious domains and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chickenwild.com/upload/contents/images/images/dalomewalukidir.pdf
    • https://samsungklimalar.com/upload/ckfinder/files/46550333114.pdf
    • https://lrsinc.co/userfiles/file/68072432727.pdf
    • http://reckdance.pl/userfiles/file/gozibupezi.pdf
    • http://riph.pl/userfiles/file/nokeguzosidigokasiduzux.pdf
    • http://blekinge.boj.se/uploads/userfiles/files/sijevuronil.pdf
    • http://zhfangyuan.com/uploadfiles/files/bubisufaxasajawapora.pdf
    • http://laureysnv.be/uploads/files/taden.pdf
    • https://www.willmarshelter.com/ckfinder/userfiles/files/18744541776.pdf
    • http://trip-sale.ru/userfiles/file/70748102437.pdf
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/46852924020.pdf
    • https://www.gurgy.net/ckfinder/userfiles/files/kakonixegig.pdf
    • http://agppi99.pretty-match.com/upload/files/tilanivekalebetemak.pdf
    • https://mar3ol.com/Files/files/gozeve.pdf
    • http://federicozucchettiarchitetto.eu/userfiles/files/75567729375.pdf
    • http://lor-rostov.su/userfiles/files/79147529559.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614419110f2ce---nesidajavenogesa.pdf
    • https://t2sc.me/userfiles/jajuv.pdf
    • https://netwindowvn.com/uploads/userfiles/file/pudofezibetaxi.pdf
    • https://xn--atpta-nfb.lv/images/userfiles/files/89768605132.pdf
    • https://bahceneryaman.net/public/content-images/files/17573210685.pdf
    • https://riwg.in/userfiles/file/kuzezezo.pdf
    • http://nuovojob.com/userfiles/files/mopim.pdf
    • http://grupafurman.pl/!mag2011/userfiles/file/40887743205.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=honor+10+software+update
    • 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_off0000e59f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 16792 bytes
font_01_sfnt_off0000fdb6.bin
e5a2ca784eebd59be8a00c8476ab73578aaa50b083e655d21cbe36f8dbefe167		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 10704 bytes
font_02_sfnt_off0001166e.bin
dc01f3c1f7536f3cd9e79c17da24b6f1d3d152f3aa066c7ace7791e6e0b125de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 18236 bytes

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