Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a799abfde9bf5b…

MALICIOUS

PDF

121.0 KB Created: 2021-03-13 20:14:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b51954283f5921551c46fc261f1bba4 SHA-1: 78d01af3b4fd8d04049844514cf1d091c6cdd095 SHA-256: c1a799abfde9bf5bbd1e1dfdab6078bc124c37738631161259e2fe208988e974
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning attempt. One URL, https://botokaw.ru/award?keyword=mythology+definition+pdf, is directly embedded in the document's text, indicating a lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/award?keyword=mythology+definition+pdf
    • https://cdn-cms.f-static.net/uploads/4389394/normal_60106256d11e9.pdf
    • http://mapotilij.mygamesonline.org/keluritezaninuva.pdf
    • http://milansit.space/63656377594c514h.pdf
    • http://demuxum.getenjoyment.net/91452703319.pdf
    • http://sakhavto.ru/lezemoke7ifht.pdf
    • https://cdn-cms.f-static.net/uploads/4376375/normal_5fd2ec445de57.pdf
    • http://wasatosu.sportsontheweb.net/fogote.pdf
    • https://static.s123-cdn-static.com/uploads/4407729/normal_5fcb76b641a55.pdf
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5fec20cbcca87.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gawabog/belly_full_but_them_starving_meaning.pdf
    • https://s3.amazonaws.com/sutawowirosuvuv/vogizesedutulizo.pdf
    • https://s3.amazonaws.com/wujixus/arma_3_server_files.pdf
    • http://wobadumiravolu.atwebpages.com/fitinaxilo.pdf
    • https://s3.amazonaws.com/jonora/papadefulobi.pdf
    • https://s3.amazonaws.com/jaloto/31790004397.pdf
    • http://solugivewatewa.myartsonline.com/central_florida_planting_guide.pdf
    • https://s3.amazonaws.com/rakabexozu/corazon_de_nino_piano_sheet_free.pdf
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_6b16a93246b8499799e4072eff22a478.pdf?index=true
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_7563e0df113942db9c322fe365654662.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000185c7.bin
06f6c78e4f7ef114bdd4bd4f4c574624b9cb615ec2955915cb3cb2bb5e1d22e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x185C7 4712 bytes
font_01_sfnt_off000195de.bin
486f97bcb1a91e2f4c183c82df8339e6f540890d189fad9b922d81c1c32f845a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x195DE 16692 bytes
font_02_sfnt_off0001c864.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C864 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.