Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc92b353cf415f30…

MALICIOUS

PDF

77.2 KB Created: 2020-11-09 20:16:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7d6bcb2021a2cde332ddd1e9a1f58937 SHA-1: 90c7de07043492a2046c83ed05f65e6bf8775d50 SHA-256: dc92b353cf415f3068b96ce0ba277191fd10cdcd12a07b0fd6a87d1ed9c538ee
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 0.9997

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/aws?keyword=craigslist.com+north+shore PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426279/normal_5fa6ab01956fb.pdfIn PDF document text
    • https://puwexisafiza.weebly.com/uploads/1/3/4/5/134586360/2001327eeeb.pdfIn PDF document text
    • https://sefuzogesosemo.weebly.com/uploads/1/3/4/5/134579576/jigolikalazovel-gebuj-mopajidafe-livudawep.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://s3.amazonaws.com/zurovajij/animal_crossing_new_leaf_decrypted_rom_citra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa80faf3-5960-477b-a5c5-bc974aec7049/xisagikilak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2e82dd-e42a-4146-ada7-dec56b9f9d1f/78734145848.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/spanish_bilingual_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/frequently_asked_questions_in_an_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/case_interview_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/examples_of_2d_artwork.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803d9656-a6d2-43c6-a388-1b50c3748caf/idiom_meaning_blessing_in_disguise.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/domilinoto.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/43925331467.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 5056 bytes
SHA-256: 95ba71365374cc016cd6ba107520e5bc6387dd2330cc941b4147428bf31fb42f
font_01_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 10792 bytes
SHA-256: d0aaa99fe4acd6e939defcdbde73da3b50e189d76e71e6773f1fe763bfbc4931
font_02_sfnt_off0001186b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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