Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c88da44faae51f8…

MALICIOUS

PDF

76.7 KB Created: 2021-03-25 01:13:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e084938bb1475f5e80a96be15e9d81b2 SHA-1: 24ea47fbe1088ac01ce23aa3ea5de1b1c70e2e24 SHA-256: 7c88da44faae51f8f521deb04a63fd447ffb81bade8dc630b70fd920a73b289b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary URL, https://maypoin.ru/strik?utm_term=books+similar+to+the+eyes+of+the+dragon+stephen+king, appears to be the main lure. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

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://maypoin.ru/strik?utm_term=books+similar+to+the+eyes+of+the+dragon+stephen+king
    • https://nakeripa.weebly.com/uploads/1/3/2/8/132814262/884c75.pdf
    • https://cdn-cms.f-static.net/uploads/4425217/normal_5fd7d2e63bd02.pdf
    • http://bibopasaxuvibu.mypressonline.com/ff7_strategy_guide_ps1.pdf
    • https://domafotenok.weebly.com/uploads/1/3/5/9/135973376/xasaxizigokup_kujotupisuma.pdf
    • https://cdn.sqhk.co/metevetufi/wr14Pjh/molovesalilinijivepijado.pdf
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/63271c1e6.pdf
    • https://mufejuraziga.weebly.com/uploads/1/3/0/8/130814984/1489892.pdf
    • http://kidufamipowanot.mywebcommunity.org/gomapeboparu.pdf
    • https://vimiwakemimug.weebly.com/uploads/1/3/1/6/131606159/1443b98a.pdf
    • https://situtewazugigev.weebly.com/uploads/1/3/4/2/134265876/242fa710f.pdf
    • https://cdn-cms.f-static.net/uploads/4366655/normal_604ca1d6ef157.pdf
    • https://kavavori.weebly.com/uploads/1/3/4/0/134012315/a900396123.pdf
    • http://lenuvivureropi.scienceontheweb.net/is_cyberpunk_2077_exclusive_to_xbox.pdf
    • https://cdn.sqhk.co/metajewamiva/DjgJihg/meme_song_soundboard_meme_soundboard.pdf
    • https://cdn.sqhk.co/rilowikapaz/gdicshd/tower_ballroom_new_brighton.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_b493cb03a64b462a937c72bdda3cc46c.pdf?index=true
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_9b11612755ce49dfb31b384d673dbc20.pdf?index=true
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_27c86e0d8a04409793667e1386a5c046.pdf?index=true
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_fcb0b21d5e224b288fcf6708304667ad.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8a.bin
4bbfb2592ef0043caa9218b196cb5143bc7f2da3d3cc9f172f8e507d2bbe46cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 5672 bytes
font_01_sfnt_off000100bf.bin
b231c683fa353c54c0b743137d9b1047de6917576d0e5d51be5f6f4d655a029d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 10636 bytes

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