Malicious PDF — malware analysis report

Static analysis result for SHA-256 193bb34c071ba0c6…

MALICIOUS

PDF

76.9 KB Created: 2021-03-07 23:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 02ef312c784be7bd3283b3ed8ef85715 SHA-1: 88f9cd164339c08810754313a75da473dd101f07 SHA-256: 193bb34c071ba0c67b7a7afd3aad2e7be2ad737570b17439ca5d981b12bb9041
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, indicating a link farm designed to obscure the ultimate destination of users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and extensive external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=kenmore+air+conditioner+manual PDF link annotation
    • https://siketaxugulus.weebly.com/uploads/1/3/5/3/135309361/3912bf5d250a.pdfIn PDF document text
    • http://zokupez.mygamesonline.org/add_monster_manual_1977.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/samsung_series_6_55_inch_smart_tv_specs.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/kuruvubokefuxuv-nibax-biwuvurofiviwe-wozigozuxeba.pdfIn PDF document text
    • https://zuzivesenuduk.weebly.com/uploads/1/3/5/3/135317613/3697434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465914/normal_60449556e024f.pdfIn PDF document text
    • http://nokobefisedo.iblogger.org/34194940647.pdfIn PDF document text
    • http://kawofeme.iblogger.org/bazepekisur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_6031e2a71908c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496001/normal_5ff5d106acb17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/71328798906.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/58554965695.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/kedinomutoramowut.pdfIn PDF document text
    • http://dofiruser.epizy.com/budevedumazapuzulow.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/34322888186.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/21919029637.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/how_to_clean_the_water_softener.pdfIn PDF document text
    • http://jefusebu.epizy.com/fagemiworuxogufefititerun.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 4876 bytes
SHA-256: e1f6260a5c4d2b1af1efe2017fa00c173efb25ae56d60e6a246ebd001e8eaf67
font_01_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 10896 bytes
SHA-256: 384c7652fd70386bc0a02f815eda62e984162f02f59c77441a5d6f3a1603a96d

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