Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7de70086661257…

MALICIOUS

PDF

79.7 KB Created: 2020-12-22 18:25:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 37a5634d251029d88008dba78856ead5 SHA-1: 20e6ece879ff43de5edb27f3a35b888e97c3a42f SHA-256: 0d7de700866612576cfd835dd8e9f26c945d8e5d4db4744e8f7c45a62ba31e3e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link farm and a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the sheer volume of links points to an attempt to manipulate search engine results or lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=exploration+definition+and+pronunciation+of+insouciance In PDF document text
    • https://jikolugoxolij.weebly.com/uploads/1/3/1/3/131379047/zovazerazib_direbif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485698/normal_5fdd6425be46c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366337/normal_5fe1565fd4fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415756/normal_5fd2a8042923f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369162/normal_5fdf5433d990d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424405/normal_5fa6b800e15ab.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/beca8b1a-e6a6-42b3-9821-4583895aefcc/86788241181.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf58de9d7936484085484e/1606375647897/neuter_gender_meaning_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9770bfa8-8f2d-4236-bc6d-7fa88cdaa083/zugaxijigutifuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9073db-0e25-4fa6-97c6-594b76ea221b/85635018563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46bf1c0d-687e-4763-941b-c38f0ea2ac28/american_girl_bitty_baby.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd131452f90b7fe52ecb/t/5fc253e7645712565487fd90/1606570983787/new_idea_manure_spreader_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44991419-1b0a-493b-a1a2-8d3b212c59c2/fit_over_50_by_walt_larimore.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_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 5172 bytes
SHA-256: ffa8be407ff0449849aa15b7f58af02644c4dc1fb2bfdd946fe569fbdcae5074
font_01_sfnt_off000104d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 13508 bytes
SHA-256: 617bdc415e438201851cf86ffc4dc04b442a10f5c9a7973d8c90f9484bb3df8b

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