Malicious PDF — malware analysis report

Static analysis result for SHA-256 f660da647f21400f…

MALICIOUS

PDF

76.6 KB Created: 2021-02-27 19:14:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f6d326775b112d9ed93f7495692d8fdc SHA-1: 7d49d7b53f68c27a415dcdab352c82b1f9bd9aa9 SHA-256: f660da647f21400f0caa3c2b5fe832d2c493e5c8b445771258ed1b0e6a4a9bde
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 link farm', suggesting a malicious intent to manipulate search engine results or distribute malware. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of external links and the heuristic firings point towards a spearphishing attachment used to deliver a payload or redirect users to malicious sites.

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://ponafet.ru/award?keyword=bright+line+eating+food+plan+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489599/normal_5fe334c8b3f75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491965/normal_600c60f0c661a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_602cb8c918774.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/dazetefowawija-lusepisok.pdfIn PDF document text
    • http://neritam.22web.org/66779537857.pdfIn PDF document text
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/rekorumo_sonelow_kivusidit.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/9847942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_60216bbd031e9.pdfIn PDF document text
    • https://jeregixir.weebly.com/uploads/1/3/1/3/131381720/3116681.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5fedd766d520a.pdfIn PDF document text
    • https://simisasokudu.weebly.com/uploads/1/3/4/2/134235492/kisat_misexova_nililiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://benugafudom.epizy.com/gulavato.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/5471326703.pdfIn PDF document text
    • http://furofazitogo.epizy.com/jolly_phonics_songs_lyrics_free.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/cinema_hd_app_for_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/2016_toyota_avalon_touring_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/81020276739.pdfIn PDF document text
    • http://zizolim.rf.gd/chuck_palahniuk_choke.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_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 5176 bytes
SHA-256: 6cc3968679b8e37561d4201ceb4b26cb518d1cfbfb47c54f576d29c389b7bf7b
font_01_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 10120 bytes
SHA-256: f680258e7356213d58de0230796743f9f50a3a811ffa70d08f4b8f3e7338324f

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