Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c91f4c011212e1…

MALICIOUS

PDF

72.3 KB Created: 2021-03-03 17:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7e6fc7f9574602503f873e846f690e38 SHA-1: 6d087f1a092de0d926ebddda8cba7a83b941096b SHA-256: 58c91f4c011212e174f8bd8a629078fb44c16567c831340898bba1381bbe988c
186 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm used to distribute phishing content or malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://fokemale.ru/award?keyword=line+6+pod+x3+pro+driver PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381756/normal_5fce86a8c854e.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/ijdr3yc/bloop_go_apk_android_oyun_club.pdfIn PDF document text
    • https://raxipova.weebly.com/uploads/1/3/4/2/134234678/c6963.pdfIn PDF document text
    • http://tifizifojaf.iblogger.org/51519599227.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/gcghwjb/72026281379.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/ibjghit/87607686630.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/1gdhcEb/97869008275.pdfIn PDF document text
    • https://cdn.sqhk.co/xugikokazo/cWXPvic/viral_face_app_news.pdfIn PDF document text
    • https://muwivagejexe.weebly.com/uploads/1/3/1/3/131379070/1530616.pdfIn PDF document text
    • https://kusejibetejoxer.weebly.com/uploads/1/3/4/7/134749151/pipelafivaduwep.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/3958697.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sumorililuduj.epizy.com/business_information_tech_course.pdfIn PDF document text
    • http://zekubegem.epizy.com/72030360371.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/95672976111.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/sodojevexivudifumu.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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 4920 bytes
SHA-256: 8f22e5f7b6c843ed51525567bb49f0d56cea2fe2b4386f98a9de843ae1e6b89b
font_01_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 10412 bytes
SHA-256: 080a962796c1e2153926b4950edb75833fe05005426f81e1edb465b3c62cf05a

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