Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc83e6e7b71b930a…

MALICIOUS

PDF

74.0 KB Created: 2021-02-16 03:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f19cf3db46b1ea031d814c5b23f83699 SHA-1: d92cfd54dd6860f3a54a8d16b6464654f3cd60e7 SHA-256: dc83e6e7b71b930a8c6103bd4d51ea04a5fbfb4e5f5711f8c8d56901c32dd22f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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://druttle.ru/strik?utm_term=is+the+original+mad+max+movie+on+netflix PDF link annotation
    • https://cdn.sqhk.co/jogekiluse/mYnQQif/tamujizusigupakojo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482189/normal_5ff7cb98da6a1.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/8ggjbih/85033263029.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_5fe1cf8da159f.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/xpiaT9r/35012339877.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/670bbe.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/puvurolesabof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483104/normal_6024a0f34aa08.pdfIn PDF document text
    • http://arm-watch1.club/vegidurigaminerewzdz9r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5fef413723501.pdfIn PDF document text
    • https://babibogek.weebly.com/uploads/1/3/1/3/131379554/xoxibifafex-difexedizidaba-nekilije-davawabovesa.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/xukanomarexumu/darwin_city_map.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/35773325665.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/22540887263.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/fufovogosodaje.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/44944119974.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_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 5384 bytes
SHA-256: 8600632fea0533f736967dcd8dbeddff43c5ddbeff5d5110d086de7f16112db3
font_01_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 10528 bytes
SHA-256: ba729ba882a165f5a207aec7e2494dc6faefdf0fd58361a7693e3a11341d1aca

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