Malicious PDF — malware analysis report

Static analysis result for SHA-256 157fb716cf1a8768…

MALICIOUS

PDF

76.7 KB Created: 2021-03-22 23:38:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d386a23303354cbd4708824446acd6d SHA-1: 50c4f5784cb49edd22a81ab57a67068454279c6b SHA-256: 157fb716cf1a87684dd08866fdd10e15502c178a04690b590be42d6ccff1529f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many external URLs strongly suggest this malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=conservation+of+momentum+review+worksheet
    • https://sawanizoso.weebly.com/uploads/1/3/4/6/134654845/nawixawafiboj_tukama_bipoxovanaxilaw_lonodesujalimox.pdf
    • http://kitusozuza.22web.org/pebuxuzogunawojamewi.pdf
    • https://sumewawuvivifos.weebly.com/uploads/1/3/1/3/131380344/zobinowanibitozopodi.pdf
    • https://static.s123-cdn-static.com/uploads/4477163/normal_5fdf7126a067e.pdf
    • https://cdn-cms.f-static.net/uploads/4461791/normal_601c9a5289160.pdf
    • https://dajoromu.weebly.com/uploads/1/3/4/3/134309711/zawezavaj.pdf
    • https://cdn-cms.f-static.net/uploads/4464303/normal_5fe6734b0b70e.pdf
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/givobupawitoj.pdf
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/totevafeja-podovelusanak-nutufubom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pusolefosex/elementos_que_conforman_los_metales_alcalinos.pdf
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_8b1edef87141454aaee1ad8e733c956a.pdf?index=true
    • https://s3.amazonaws.com/vazisi/71254293913.pdf
    • https://uploads.strikinglycdn.com/files/e72270fd-3341-4e61-90d8-5c6329c25c36/samsung_galaxy_note_4_fast_charging_cable.pdf
    • http://bapaxofobawob.rf.gd/xosunilozi.pdf
    • https://uploads.strikinglycdn.com/files/6a47a457-2d0d-40f9-a7ac-9a15d86e07bd/nerofofo.pdf
    • https://uploads.strikinglycdn.com/files/14a398f0-cad4-4f9f-8829-fcf94c10a3b6/68616610314.pdf
    • https://uploads.strikinglycdn.com/files/54ed2661-8ac9-4d20-a7ac-c5c56ba10fbb/bezatalira.pdf
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_8740a0dc844b4c1bb0897d3a9fbad353.pdf?index=true
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_5eb4abca03c843fdb8259294647af174.pdf?index=true
    • https://s3.amazonaws.com/rawesaragegugar/haryana_hssc_ki_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/d9a961e6-af92-45cb-8785-80fde25197e9/what_are_the_benefits_of_cherokee_nation.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29e.bin
b441ef0f54c8fe891f92c38d5c497a104e5514311c8d84350ee661ea7a62ee6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 5096 bytes
font_01_sfnt_off000103dc.bin
a94de1029d8255a2735ca24d09e8d7b1893efc721a238ae3f8dcb06f5c9ae4d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 9824 bytes

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