Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c16137d5acabb4…

MALICIOUS

PDF

79.8 KB Created: 2021-05-24 14:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 74800270813ae8d456e2efbca7d011e9 SHA-1: 332c92064f42dc4db0991bac05d30260d15962b3 SHA-256: 16c16137d5acabb43b34dce1a88ad6b03895774391ce53016aebfabb40d619b4
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to a search query, suggesting a lure. The primary IOC is an external URL embedded within the PDF, which likely leads to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://seumenha.ru/strik?utm_term=can+i+get+snapchat+notifications+on+my+fitbit+inspire+hr PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447436/normal_5ff26646f3c8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498345/normal_603d31ce89877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5fdc72d9db2b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491398/normal_60433d97f1ebb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447431/normal_606d250aa0e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_604511e593d88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/lonepasesinemasowib.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/24603475246.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/78392055767.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/spanish_frequency_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8906454c-9111-4a9f-bd4f-957f9a5eb381/zajodejewevovawetivoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f6d788b-80b6-4a55-b15c-ff47c0b41715/cuantos_centimetros_son_inches.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/ridikovoxorulev.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/fewesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55345a93-4ae0-43a3-83f3-d85c846b5968/siwazumufi.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/povutipurodiwimalabafop.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/how_to_write_a_latino_character.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/1881637719.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/toxejibivekiwutobinesukid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1f61a5-a39c-4bf0-bf46-6ba7ecf14786/seduwezaperumu.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/bharat_south_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/585a8178-2211-45d6-b43d-2510d47cc5a6/gizmo_evolution_mutation_and_selection_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/seforamawumolibe.pdfIn 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_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 5544 bytes
SHA-256: 505881e6d91d3b29657eb73569ca487c0f18fae6f94bdd70ebf0d102d24830c2
font_01_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 10240 bytes
SHA-256: 8ec8c80d1dcba43750287ae1473f3a2fa935f966a1c3908b2588afce741659f0

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