Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8195be7882b4db…

MALICIOUS

PDF

80.3 KB Created: 2021-03-18 13:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 649424a13ef2b8cdc775d741f329fd56 SHA-1: 7f0ce05407cd860cf5994e7b84cd809fa971f1cd SHA-256: 4c8195be7882b4db6e2cd6fa604197ceeccbb28ca91e0f882ec1134c0239a03b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains references to 'Pampered chef breakfast sandwich maker recipes' and 'wkhtmltopdf', suggesting a lure to a website that likely hosts malicious content or phishing forms. The presence of numerous external URIs and link farm heuristics further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://midufefew.ru/wix?keyword=pampered+chef+breakfast+sandwich+maker+recipes PDF link annotation
    • http://coolmag.biz/9054866976oucx.pdfIn PDF document text
    • https://linezeludamaxen.weebly.com/uploads/1/3/4/3/134340908/pevelifisifodo-ledidugizumuser-jijurizoreka-gegezata.pdfIn PDF document text
    • https://bodowijesajuru.weebly.com/uploads/1/3/0/8/130873867/zejeso_meloweruvow_debibajutugi.pdfIn PDF document text
    • http://insurerhome.ru/bulavafagudot5lwk4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480732/normal_5ffeb20309a19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478703/normal_604752a6e6a2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388157/normal_5fe0b70d84a98.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/44716623091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458125/normal_5ffba0da74760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_5fd7a94ab69a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387419/normal_5ff1e907b3fef.pdfIn PDF document text
    • http://ladunalufim.iblogger.org/kojuzifonakefemifef.pdfIn PDF document text
    • http://retamos.mygamesonline.org/posevaja.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/5c9afff757818aa.pdfIn PDF document text
    • https://wajuzetixageg.weebly.com/uploads/1/3/0/9/130969085/9589088.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
    • http://dinupuz.rf.gd/brothers_grimm_short_stories.pdfIn PDF document text
    • http://lemijafuw.epizy.com/vixetabag.pdfIn PDF document text
    • http://gisebebego.rf.gd/45846516352.pdfIn PDF document text
    • http://vexowiwoputam.rf.gd/91590350371.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_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 5336 bytes
SHA-256: ba73da8a93b74a64cca7df7485c27d6b900edb82d3a7a0013f3f02afa664f9de
font_01_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 11780 bytes
SHA-256: 4f2fddbd6faabb01eeab178ac29bd13fb1cde24f14290058fd0ed1431d53b2a6
font_02_sfnt_off00012556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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