Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca162ebc68f096f…

MALICIOUS

PDF

110.8 KB Created: 2021-05-23 01:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5c3d87401c743d68f21cdb73c9673b8e SHA-1: 2a37ddc12092cb43e2ce7cd1826c3cad31da9360 SHA-256: 2ca162ebc68f096fe5e79119e76069f8a264617e5913fe0e7789bb624bbf6695
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files with numeric or generic slugs, indicative of a link farm or SEO abuse. One prominent URL, https://jumiwimov.ru/strik?utm_term=is+sodium+alginate+safe+to+eat, suggests a lure to a potentially malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://jumiwimov.ru/strik?utm_term=is+sodium+alginate+safe+to+eat PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465259/normal_5ff4006f35b16.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/makewupob-kapenijixe-kefikut-mewulimoki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464871/normal_5fca8fcb42376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463009/normal_5fdbbaea43e70.pdfIn PDF document text
    • https://kikeletiwemuk.weebly.com/uploads/1/3/4/6/134671512/janidapikog.pdfIn PDF document text
    • https://galifejamadex.weebly.com/uploads/1/3/0/8/130814644/7865158.pdfIn PDF document text
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/7c3bd270.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382952/normal_5fec624591fa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487665/normal_60438c5d2f9d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501367/normal_601f90f925325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425256/normal_5fdf254d48348.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370309/normal_5fd0697939f00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381541/normal_5ff64b0638528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464522/normal_60650cb79ad6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488582/normal_605ddb00e3a2a.pdfIn PDF document text
    • https://dixufewopirar.weebly.com/uploads/1/3/0/7/130775961/wanetasixi-bojilozomurij.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/607735aa-5260-4b23-a3a9-3fd42a6e0982/kolidijirobowoteluken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e23a3af3-5298-4719-a444-5aee1f616c62/president_forever_2016_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d7349d-3a5c-4f01-a0a0-207ff303bb3a/garefuwafutu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBB 5068 bytes
SHA-256: 4ed1d0e4c1d9434bafb973d72a632aa90dc31c6f4c6df803d033294df2333d1a
font_01_sfnt_off00016fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FEA 11920 bytes
SHA-256: 301d39fa967ed64075f9b26ff6d2eb9b5e15cf90e1d6177347e152a7e3c0495b
font_02_sfnt_off000198b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198B6 16148 bytes
SHA-256: 49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648

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