Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf145d26cf9adb6c…

MALICIOUS

PDF

75.8 KB Created: 2021-05-22 21:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3a609bef8d5f7022c845ceb804ea6ca7 SHA-1: 6b5497711835e1c084e2645ab6528286b6eb9a1e SHA-256: cf145d26cf9adb6cd8316643a925d380adaf57aa13098e74cd3f00c62a9465d7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or distribute malicious content. One prominent URL, 'https://jottigo.ru/strik?utm_term=abusada+full+song+mp3+free+download', suggests a lure for free downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=abusada+full+song+mp3+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366010/normal_5fe0a1716eeaf.pdfIn PDF document text
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/3112792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412582/normal_606b22f439145.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474220/normal_5ffa5b1c46685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_604e8536455e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407989/normal_60682a8d0931c.pdfIn PDF document text
    • https://lofizalu.weebly.com/uploads/1/3/4/6/134601384/sitifunera-mamonunupoba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459654/normal_5fca030e217b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35fc567-278d-4089-8d5b-67863fe940ef/49819707591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d879b3-0829-4e48-99a0-b3ddd7235c90/59630399126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e731ba-5f44-4c01-8a36-a9dc941809c1/dikotexatabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b6a17b-756d-4385-b833-06b8aef10447/ginelekudafel.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/tp_link_tl-wr841n_red_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10dcd7a-8402-4a32-a567-3cbce34dfd80/how_do_i_change_the_thermostat_in_my_fisher_and_paykel_fridge.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/lagu_yang_terdalam_versi_reggae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db22ce1-415c-4bb7-bd4f-6d0100d76d8e/71688637833.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/perimosebowetiwajobupiti.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/cuanto_cuesta_el_metro_cuadrado_de_terreno_en_el_estado_de_mxico.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/soft_money_mp4_audio.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_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 5748 bytes
SHA-256: 899d8758228ccdc8a15345c15470ea92f4afe8a0f5a815be00ade6ed6b562a67
font_01_sfnt_off0000fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 10888 bytes
SHA-256: 8c5c8d261608427aa222b2db7b1981f69a8e5fd3e2c20d7d1af02d7b8a19df17

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