Malicious PDF — malware analysis report

Static analysis result for SHA-256 6831f5db61396688…

MALICIOUS

PDF

75.5 KB Created: 2021-03-31 05:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 56710c5034670679b71d57b1a2c2e529 SHA-1: 20beecc681929cddcf78c9531e7a1cdb8fabc206 SHA-256: 6831f5db61396688b81745ac215c35461959d3fa42eb308625c953273e2c8898
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious websites. The 'SE_CALLBACK_LURE' heuristic indicates a phishing or tech-support scam pattern, and the ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/wix?keyword=wayfair+coupon+2020+canada PDF link annotation
    • https://mawubuzepegi.weebly.com/uploads/1/3/3/9/133989242/11262.pdfIn PDF document text
    • https://boviseweduxiraz.weebly.com/uploads/1/3/0/7/130776594/gavavofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_603821ca9f45a.pdfIn PDF document text
    • http://turistik-a.ru/53508198731oczzh.pdfIn PDF document text
    • https://soxotinimom.weebly.com/uploads/1/3/4/8/134883838/murazepowabon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527902/normal_603a96cc0d2c3.pdfIn PDF document text
    • http://baugroup.info/832462454437ie2d.pdfIn PDF document text
    • http://policyhelpcenter.com/carols_by_candlelight_2018_melbourne_tv_guidefucoq.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/Y3PxvEJ/vowisamaxaled.pdfIn PDF document text
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/lawofazezagigi.pdfIn PDF document text
    • https://rofizikijomosuj.weebly.com/uploads/1/3/4/0/134012810/vumovebijakukom_wopafejijo_jagugote.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • https://varavedonenen.weebly.com/uploads/1/3/4/3/134316352/13dd3d02d6f.pdfIn PDF document text
    • https://jevogebog.weebly.com/uploads/1/3/2/3/132303093/cca6af53fe165.pdfIn PDF document text
    • https://kunizemofowirux.weebly.com/uploads/1/3/4/3/134311671/01b269853d184.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/b9haEji/vemovigekopa.pdfIn PDF document text
    • https://fejovixojik.weebly.com/uploads/1/3/4/3/134333762/757e6896d726ad.pdfIn PDF document text
    • http://golden-bridge.pro/8981356331ytk15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_0821a647260c4fd3830b29dfe5960c19.pdf?index=trueIn PDF document text
    • https://04fc2a56-3ca8-4b90-bfe8-b05f9e7ed3d8.filesusr.com/ugd/51e9d0_08a0eef8e90548898d566109a66ecba3.pdf?index=trueIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_a9dc7592070b4fc2b070df56493dbe26.pdf?index=trueIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_15c1c117b0724a518bcf7d9ce5f07060.pdf?index=trueIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_40dac7f8f4ad4071bc20c7d8eb36c305.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 5328 bytes
SHA-256: 366ea65f4d44005f551d31cce3232d33eb516a48072f5425f10b98a453cfff65
font_01_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 11336 bytes
SHA-256: 4b1c512b97a7558e41993dc2db41475e91252030e8ffbdefb140889e481774b9

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