Malicious PDF — malware analysis report

Static analysis result for SHA-256 45eff1d22b85bf2e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 03:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66e9e5d3fb79a33f8391b7608eb7fca1 SHA-1: 2118388fb3a79c9edb47204c85e576ac8e7968fd SHA-256: 45eff1d22b85bf2ed1d43b5937e98bb4211fa89cba580a042a5e1522ffc8e71c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://clevio.biz/fckUpload/file/bajekaragegukoweretiki.pdf In PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/22359810992.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/28520689594.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/62755707986.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/78271086587.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/11330331457.pdfIn PDF document text
    • http://cordovajewelry.com/images/file/vasur.pdfIn PDF document text
    • http://metallpress.info/files/53988506715.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/jumijizidisaladenoximiged.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/72132263901.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/82826935947.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/wetugumorolitikifev.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/76934073657.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/37979372170.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370195efc59---wowidijoliwobizosebat.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210911_145146.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/tezitizarimivudatuved.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/35203169000.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/vafikovupiburiwonod.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/befajitememadagejo.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/legudaxir.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/fimagigirepaxegide.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2835d1183a717ff5b41333a4149100f5/maxitaluwadux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=most+beautiful+classical+guitar+piecesPDF 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_off0000c986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 18736 bytes
SHA-256: 5a07af1334091b6e8183b91c4d5f2e85c94c9f0d48c59201ce033c2b823c9692
font_01_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 10784 bytes
SHA-256: 5fdcb8e8a65933e402c2fd789a1af2150fa2d4f09dac35a7449b0a5494600733
font_02_sfnt_off00011372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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