Malicious PDF — malware analysis report

Static analysis result for SHA-256 979f36d794c53c18…

MALICIOUS

PDF

124.8 KB Created: 2021-04-12 09:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cd7d19c337114e339345c53f3865e6d8 SHA-1: c3a4a531cbf9536bf7ee6b17cbe22305b8895a93 SHA-256: 979f36d794c53c1847fadd62fece83a82086cbc5f073aadc133a31e2efce742a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically classifying it as a phishing trojan. While no scripts were extracted, the presence of embedded URLs and the link farm pattern point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://botokaw.ru/strik?utm_term=what+is+a+sith+apprentice+called PDF link annotation
    • https://cdn.sqhk.co/nuduniguwufo/i6MgNGB/unicorn_baking_games_online.pdfIn PDF document text
    • http://jevufoduxixan.22web.org/kathi_sandai_songs_320kbps.pdfIn PDF document text
    • https://cdn.sqhk.co/waketeni/ijhjggf/94489796438.pdfIn PDF document text
    • http://sowurokirifi.22web.org/bambi_vs_godzilla_book.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/jaoiiiN/36900415520.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/leributafa/63485045646.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_9d80a8a6f7ba422c93853c4d83a9061d.pdf?index=trueIn PDF document text
    • http://tigodovujoxam.rf.gd/mobile_games_addiction_research_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95999210-6ca8-4667-a951-232b3c884192/purebesivanaligud.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/kadetax.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/zopadebojutasilejomika.pdfIn PDF document text
    • http://soripijadob.rf.gd/rovemoz.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/cours_orthographe.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/beethoven_piano_concerto_3.pdfIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_c410cdaeb04e4006b90a5d7ecd13f47c.pdf?index=trueIn PDF document text
    • http://rimamosapike.epizy.com/bubble_level_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/zifuzixanamegodavano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faaacdc1-eabf-4ace-859a-aaa93ecf753f/district_nursing_interview_questions_and_answers_uk.pdfIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_6733e53b504f40a4a258f982a50b51da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55291a1f-8c5a-4a34-9e58-e68c8ceabef1/23511892168.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/43649100270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40331f7f-3c60-4de3-afee-ca7d155810a5/58231950947.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000188b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188B9 4852 bytes
SHA-256: 40267241b7985225e85c9d60eef314ff3e9ab13451dec6cbf09701411ae7307e
font_01_sfnt_off0001992e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1992E 11512 bytes
SHA-256: 4759a00877e965a4b1341f04477536f74fb92ddffe39bb8848a228530880e541
font_02_sfnt_off0001c07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C07A 16332 bytes
SHA-256: e38c1bf64764582757dc05d17ab2e5b5758b22ee08700b9db35351ba74d249e0
font_03_sfnt_off0001d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D617 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c