Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71bdb660145f92e…

MALICIOUS

PDF

92.7 KB Created: 2021-03-09 03:12:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aa6707ee94899ee50b51d920c2f5b922 SHA-1: 3ca261083a07a786b44c0ac9ac752c9f280ee3cf SHA-256: a71bdb660145f92e0c9e722c554466b5061766ab73a54033b07509df31915122
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains a link farm with numerous external URLs, including one that appears to be a search result for 'Bal ganesh tamil movie hd', suggesting a lure to disguise its malicious intent. The PDF structure and embedded links point towards a phishing campaign designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=bal+ganesh+tamil+movie+hd PDF link annotation
    • https://fozaronu.weebly.com/uploads/1/3/5/3/135349809/semusilixokujaf.pdfIn PDF document text
    • https://sitapiwagese.weebly.com/uploads/1/3/0/8/130814355/sikipototini.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420906/normal_5fd07f576589c.pdfIn PDF document text
    • http://shothard.site/88915187667bxgcr.pdfIn PDF document text
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/4decd08.pdfIn PDF document text
    • http://vulgargirls.fun/sheetrock_repair_servicesvf7ir.pdfIn PDF document text
    • http://nukicew.xyz/diccionario_biblico_holman_en_linea90pj0.pdfIn PDF document text
    • https://vixufavem.weebly.com/uploads/1/3/2/6/132683014/watopet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_5fdc6efca8462.pdfIn PDF document text
    • http://liketime.fun/guzafujimagadmjxtb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_6015c88ac06aa.pdfIn PDF document text
    • https://kopudezazuxunob.weebly.com/uploads/1/3/1/4/131408344/6095280.pdfIn PDF document text
    • http://picsonair.com/foodsaver_fm2000_partsysl16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b37e964-af7b-4eb6-8f6c-654c100bef3d/61048249474.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_441159808e074265ae228e4b83ee4764.pdf?index=trueIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_b486239c6c0b4de8b3bc62ff1f83a8b7.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_2a27b137cbad4a189761072805f75ea1.pdf?index=trueIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_750bc523e3704dd0b40b7d56f8d6d156.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a3ef98-3553-4793-8b46-aa71ce2b5bc7/what_is_the_best_star_wars_book_series.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_2914b8ffecfa4e47a6ac185a636129dc.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_18bad0594f964c88a5d0ec8480732aa7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e683e5f-9989-46a5-9cce-4d385f9e2c24/what_kind_of_oil_does_a_toro_snowblower_take.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_ea6a303832ef457981461f494ffdd66a.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000140ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x140AB 21264 bytes
SHA-256: 436c836819842ccb8be96a37c19a3d0430bab1caae9852a9dd962976fb122d20
font_00_sfnt_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 5252 bytes
SHA-256: 4f5db09db31632e41b0b07aeb7d2f2325d3ebbbf4c21c7c21cd38fb4644b7baa
font_01_sfnt_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 3636 bytes
SHA-256: 645f1fc4171176052a733c245bad8900f68862d893dc89c8f6ba6c9c5ca9aa6f
font_02_sfnt_off00011b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 10908 bytes
SHA-256: 25f28d47e6ed9ca2aba958550d6e6cbf90532ba6d408332dc4857ba43d1b23ff

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