Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1a489d37393b50…

MALICIOUS

PDF

68.0 KB Created: 2021-03-23 12:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45315e94d3fd9e8c9d80ae0d07f486fd SHA-1: bf25bed6000f308ee1840808580ae0c10e4f92c4 SHA-256: ed1a489d37393b50d0e6d8b9e97b9b4a4d174856276da01d5979d10206566789
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', reinforcing its malicious nature. The primary IOC is the external URI pointing to 'https://pelibifir.ru/wix?keyword=degraff+ohio+restaurants'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=degraff+ohio+restaurants
    • http://leledup.mypressonline.com/aqueous_humor_dynamics.pdf
    • http://fortuneo-enligne.com/prosci_change_management_methodology5fc9r.pdf
    • http://creditscoreusa.info/xirutebisorepixew7jkna.pdf
    • http://vipmanmarket.space/campoformido_udine_corrieralmter.pdf
    • http://sosiwawivijomo.scienceontheweb.net/61826199456.pdf
    • http://dufifudusimube.mygamesonline.org/daveraralevakititi.pdf
    • http://ketousa.site/71605291277ntxx7.pdf
    • http://helpforteam.com/fobekutogenarifurabepegijjaqp0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kezemiradigu/42278942344.pdf
    • https://b9b086bb-db5c-4c47-b99c-4ca3d8c772c1.filesusr.com/ugd/c090b7_7296c2c1e40a4231878a95090e00e9bb.pdf?index=true
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_2d9c62c9f3b9459c88c9834ecaa74ad2.pdf?index=true
    • http://sazoser.myartsonline.com/yoga_for_weight_loss_download.pdf
    • https://s3.amazonaws.com/fosawef/nidoxomawagar.pdf
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_d3c24834a04640c7acd2c1afa83414b5.pdf?index=true
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_0d541070330f45699b5fdc4df2848468.pdf?index=true
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_fdd40d9c06de4b198dcb67963b48c813.pdf?index=true
    • http://pekamidakoj.atwebpages.com/acfe_fraud_tree.pdf
    • https://s3.amazonaws.com/nafamaragisek/advanced_yoga_poses.pdf
    • https://s3.amazonaws.com/rorives/35061158479.pdf
    • http://biwosagamivi.myartsonline.com/argumentative_writing_example.pdf
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_5bede74a7f8744c0b78488c2faa8b758.pdf?index=true
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_e82006f20fcc404ba664ce5e67b95afe.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb6f.bin
c737e5bdd09624e2b465ade11e9de7967da150c94bf5ffcad2fef334b4796841		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6F 4996 bytes
font_01_sfnt_off0000dc76.bin
ce61f5359d7abe6ae1f5e1d04d7996441062e3e480622e304a9d7787bc086c63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 10856 bytes

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