Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39ebf6838d2a06f…

MALICIOUS

PDF

73.6 KB Created: 2021-03-18 18:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d17ab178d575d89869a05dd2cf9284fd SHA-1: b7626186a41b3610003f2735d14912cfd21ef7e5 SHA-256: c39ebf6838d2a06fde6a73a807dd2155487cadb594ad531a055c8581e67adb77
186 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 disposable hosting, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier flagging it as malicious strongly suggests a phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=innova+3030f+stuck+on+done PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470405/normal_602f8dcaba09c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_60150d153356d.pdfIn PDF document text
    • http://yatvoyya.fun/axis_and_allies_europe_1940_national_objectivesoxl1w.pdfIn PDF document text
    • http://cg-designer.xyz/9177087451091cik.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/83dc98.pdfIn PDF document text
    • https://xolopebowuraj.weebly.com/uploads/1/3/4/6/134600193/1556718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_603db894ed30e.pdfIn PDF document text
    • https://cdn.sqhk.co/zofonabiz/9Njf6ge/45908092871.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/duzuxipekodojerjbw0.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/kenaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5fe920e8c4db8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465127/normal_5fee329a1f535.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/g9idFgf/limalufolos.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/ad12df93-0d28-48b2-8192-8bea88483d31/jasekekuno.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/zowuxakefixigowuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a925d3a-2c47-4b36-8edc-d857c43b452c/29047609981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/074a8594-4d2f-4215-b2be-80cb82d446e7/suzuki_piano_book_1_songs_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03006c60-766a-46a5-93cf-1f43479f21b9/22479487557.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/texoxuminokepof.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/gusej.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/consumer_math_commission_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/2014_mazda_3_gs_owners_manual.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_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 5252 bytes
SHA-256: 5a29909b6660822e2954e560053404556d36a0e2486146f50fb46e324bc4768c
font_01_sfnt_off0000f49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 10688 bytes
SHA-256: 2afab4c037dff6c13423604f072db4629497d5c3bc7be42e16fd9815e396ad2a