Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77a322f813b9ea7…

MALICIOUS

PDF

110.9 KB Created: 2021-03-05 18:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 840cf47782509f87b8423aacc95eec89 SHA-1: 9bda9e04ec72660c003fa312656bc62f0385cc27 SHA-256: e77a322f813b9ea7e6d11cdd7073243385c53a38e52ab222f15b539d8d954d51
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to disposable domains, suggesting a link farm or SEO spam operation. The primary malicious URL identified is https://baarspo.ru/strik, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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 https://baarspo.ru/strik?utm_term=why+did+madame+butterfly+kill+herself PDF link annotation
    • http://want-seo.ru/327651418905c5qm.pdfIn PDF document text
    • http://shimano-stradic.ru/kopoxefalofosusuwoji2n9s.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/kopoduboroxitadusujls6x.pdfIn PDF document text
    • http://besemafobekilir.22web.org/georgy_girl_sheet_music.pdfIn PDF document text
    • http://datingdate.site/nakujejudazugana2ag0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_08fcd654926b4e338f56b22de1d81e98.pdf?index=trueIn PDF document text
    • http://tebetuv.rf.gd/modes_of_heat_transfer_nptel.pdfIn PDF document text
    • http://desakoda.rf.gd/colombo_city_map.pdfIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_b65ed4fd6b454f79a13bf03990a802c2.pdf?index=trueIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_d51882fc7d4a4ee0ac6694eae1abca21.pdf?index=trueIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_b58ef443e4834bdba59c986e948b57b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d943370c-1990-4782-aa41-30cdde44bd08/74625918758.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_6021f5707aa448a2ba427f553ebbeed5.pdf?index=trueIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_9b9856ffbdc447b3ad5ecbc8de562f32.pdf?index=trueIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_171f1f9e81fa41509ec25732ce8c7c98.pdf?index=trueIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_f8272fc89f004ad796397138b65f29e0.pdf?index=trueIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_08b3bc21c91b4c5fbcc8906c2ec0a8e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c21ea1a-6e5b-4409-ba36-0eca815f07f8/wubejukulala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef7bd72f-dce6-4a06-bc0e-e7156dd95101/niroxedera.pdfIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_3f742cd8395449d2ace696b7c0f7cabc.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_9d94198d5f434ef99db6fb723efcd3be.pdf?index=trueIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000162ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162AE 4888 bytes
SHA-256: 9b727b68302e9dd737ec74847bbc2c68c30d4a7e531213bd06f569968cffa2e7
font_01_sfnt_off000173ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173CA 5464 bytes
SHA-256: 1cb4cc04e9bc38167b7e649d5e9e02458ee497b57690eaa3300fd01de4746179
font_02_sfnt_off00018643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18643 12168 bytes
SHA-256: 3a896552018556c448be50769c18b8eed20cd9231c206c9f1ec08a00dc614f63

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