Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b8bc6e38ade6a2…

MALICIOUS

PDF

77.9 KB Created: 2021-03-31 19:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f5aee98848b7b16e174d6063bb647f9a SHA-1: 7b5da3110fd3fb6a64806ebf9540dda28f018d48 SHA-256: 42b8bc6e38ade6a2226be46f94dbeaaa1909f7afaf7df30cc5333ea721220380
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary URL, https://botokaw.ru/award?keyword=types+of+biomass+energy+pdf, is suspicious and likely leads to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://botokaw.ru/award?keyword=types+of+biomass+energy+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426059/normal_5feb8e787871f.pdfIn PDF document text
    • https://cdn.sqhk.co/kofatuziwu/7xCAVha/e_coli_symptoms_baby_nhs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404723/normal_6050afff8078d.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/bZjajg4/zero_gravity_skydive_drop_zone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458631/normal_60354515d2264.pdfIn PDF document text
    • http://arendagg.xyz/vulisazozl1cb.pdfIn PDF document text
    • https://mebavowu.weebly.com/uploads/1/3/4/3/134353315/xazisexigamajatuj.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/jfjgYs5/98812922644.pdfIn PDF document text
    • http://lessonsonline.site/religious_trust_deed_format_in_word3qdfq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379718/normal_5fe5141f13d04.pdfIn PDF document text
    • https://xegiduburap.weebly.com/uploads/1/3/5/2/135294675/dibirunoxunogo-vunimige-xiwajuxodenumug-warikabunazep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_605b727dd3296.pdfIn PDF document text
    • http://arendagg.xyz/25473890276s6m9t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426690/normal_602d40d334e5e.pdfIn PDF document text
    • https://jivikusobule.weebly.com/uploads/1/3/5/3/135326696/dofulijatatemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490936/normal_6013328e61226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_6016549342923.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0554d3-fdf7-4547-9275-5af91fe4f7eb/2000_7.3_powerstroke_rebuild_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07385fa4-1dff-4aaf-8967-1d72aa5b1573/fadeper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07956eb4-457d-42b0-887b-d17d95d15012/carryon_my_wayward_son_lyrics_meaning.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_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 5520 bytes
SHA-256: 36f2dbee574e17b2b76522558674d0cefb20a37f8153480384c09cfda7676787
font_01_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 10684 bytes
SHA-256: c143ffd4166bde63cf021fc1c1c8dacf5389013066c5f1ad660239dc43cc34d3

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