Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b62df722d545254…

MALICIOUS

PDF

72.3 KB Created: 2021-03-05 21:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0f88419c4d0b8d7d2080828334d30b97 SHA-1: d79782ff0cf15716600504027b02c55f4295a37d SHA-256: 9b62df722d5452544798d3fc2253969d34739b9b726445e910d368b4b73c2103
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains references to a stapler, likely a lure to direct users to malicious URLs. The presence of ClamAV detection and ML classification strongly suggests malicious intent, likely to distribute further payloads or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=how+to+open+swingline+heavy+duty+stapler+39005 PDF link annotation
    • https://cdn.sqhk.co/wusakituzu/jBibd24/wuputagujup.pdfIn PDF document text
    • https://xexunejakex.weebly.com/uploads/1/3/4/2/134266262/suxamijenozoz.pdfIn PDF document text
    • https://varijamali.weebly.com/uploads/1/3/1/8/131856150/83ae7a04ae8601c.pdfIn PDF document text
    • https://cdn.sqhk.co/dawolesirip/fqjgTgf/81309418270.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/sarurivenuwobod.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/sojejubo.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/Iaie9jf/68073974122.pdfIn PDF document text
    • http://liolika-rsya.ru/panasonic_sa-pt750_wireless_speakers_not_working1mo99.pdfIn PDF document text
    • https://zamivevi.weebly.com/uploads/1/3/1/4/131437513/2699366.pdfIn PDF document text
    • http://bio-ita.fun/nixowukebesigixagetarxz2y4.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/hhcginw/kikunadezomojuxujogopel.pdfIn PDF document text
    • https://cdn.sqhk.co/fezavomol/bhgibcd/cute_halloween_costumes_for_toddler_boy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/79a32249-1d05-4b7f-a67b-b1af773a7a90/fasipepixowusasalofanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5087a3af-83ba-4442-944c-09bb55791237/80279894743.pdfIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_25627b9fbaa44cee876180f4a315c1e8.pdf?index=trueIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_390afe8b83754057a954f24ce58ffe85.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEF 5904 bytes
SHA-256: 3f262b823703f8c01627244fb6dc7bc0e021a1f89f42ceacd1fd8a2c1e83894e
font_01_sfnt_off0000e20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 10116 bytes
SHA-256: f830b6f7860e936c7ece01c4390b5f8f82da45de5b4c877a192eea535b1269b1
font_02_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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