Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8901f8164455bd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 14:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1968de1d47d6c65337fe7afe7765b97 SHA-1: 148bf161e4447aeec18eb6b9c70a65f6421ecd75 SHA-256: db8901f8164455bde5f37c8836ff66c4e21f96772b814986ded07f9a2567e353
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, suggesting an attempt to redirect users to malicious sites. The presence of UTM parameters in one of the URLs indicates tracking for phishing campaigns. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=kerbeus+k2+qr+code
    • http://americandeliorder.com/uploads/files/73950252938.pdf
    • http://rosabaum.de/web/editor/files/66175260039.pdf
    • http://855solution.com/htdocs/cljr/data/files/repalipitowerupiwudiraji.pdf
    • http://thessalonikiflights.com/files/files/sinokonovabakapemaz.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16133f7596bbee---60593692739.pdf
    • http://cl-pub.com/files/files/89399311888.pdf
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/pegalodanobipojomugu.pdf
    • https://vietucmould.com/img-vietuc/files/lolitilijej.pdf
    • http://mamaskitchenorder.com/uploads/files/91584265488.pdf
    • http://matsonconstruction.net/userfiles/file/nerofexulopeforuposevenij.pdf
    • http://nanumed.ro/uploads/files/tekusupegutinobezanazuw.pdf
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/62140171841.pdf
    • http://massimobertoarchitetto.com/userfiles/files/26898572713.pdf
    • http://186086.com/upload/files/janazerajupikotugagun.pdf
    • http://wlpp.net/images/blog/file/wewesoforuva.pdf
    • https://homestayhoian.thamtuddt.com/uploads/image/files/47948344382.pdf
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/sojebe.pdf
    • http://pengyou-english.com/FileData/ckfinder/files/20210902_391FA508D060BBBE.pdf
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/tezulaludeduso.pdf
    • https://absoluteanytime.com/media_file/files/files/bojibemazon.pdf
    • http://eegbiofeedback-leszno.pl/userfiles/file/50937465972.pdf
    • http://hoanggiaphatstone.com/upload/files/zatopojomese.pdf
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/mixexezidakifafolumefula.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_off0000e1dc.bin
1c1418c648bd72c78c1c81c9e7863a094e76175aa8b8ac749ba0664f9cc60e36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 10452 bytes
font_01_sfnt_off0000f991.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 16792 bytes
font_02_sfnt_off000111a3.bin
d0c4b9d7208f4e378641a3bcc3721c72dc689a8b9a8abfda5c915ddfc8bca328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 18080 bytes

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