Malicious PDF — malware analysis report

Static analysis result for SHA-256 c851d3fb804b98c4…

MALICIOUS

PDF

138.3 KB Created: 2020-12-13 15:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 40bd16613f08e0a5263bb8fed57d1fe0 SHA-1: b87268d224e88104b5cda3cf69b3761d5e866350 SHA-256: c851d3fb804b98c417386e8aa4bced49aad1e99a889eac181927e21ed2176d34
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://trafftec.ru/strik?utm_term=yuan-ti+clan+names PDF link annotation
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/denusubosokaxem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f8754112feaf.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/4644439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5f91a17686129.pdfIn PDF document text
    • https://nowusunomotir.weebly.com/uploads/1/3/4/3/134314498/kadunipe.pdfIn PDF document text
    • https://ranetaxute.weebly.com/uploads/1/3/4/8/134886021/maparomolol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386829/normal_5fccb0d60c688.pdfIn PDF document text
    • https://nekarima.weebly.com/uploads/1/3/4/8/134876173/zatok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_5f9b164a753e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_5fb2f6a8b2d99.pdfIn PDF document text
    • https://kofemadaki.weebly.com/uploads/1/3/4/6/134675418/finanerulurakewis.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://static1.squarespace.com/static/5fc0805cd49dd12447321748/t/5fc79fb909f4d56e8f8afb1b/1606918074888/pomepakobiralisudulowawud.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56006abaecd3318401c97/t/5fc85147e101942bf76c8a24/1606963527364/sound_of_water_running_in_wall_behind_toilet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1ac7a40f1034a5cae5b81/t/5fcf710169d6d06d554167ed/1607430405696/save_the_planet_earth_description.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27e5df7cf8c754034f2c2/t/5fc8030200658720a8227de8/1606943490555/octopus_tattoo_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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00016f9b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16F9B 32856 bytes
SHA-256: 22e618cc9f4509c15012ccc0db2bea8eb79567b749dc817f8ac4bfa41929166e
font_01_sfnt_off0001d466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D466 4616 bytes
SHA-256: 2c46b3eb0d257195d4a092c5a6ddd389c6b6db3789ea4e5311ec746f9151398e
font_02_sfnt_off0001e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3EE 14200 bytes
SHA-256: cf982482775ce83295ac7b79ad763905cce0ef4f64722b14582dba40c8c9f95a
font_03_sfnt_off00020dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DD1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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