Malicious PDF — malware analysis report

Static analysis result for SHA-256 183ebb0d53c23fd6…

MALICIOUS

PDF

67.6 KB Created: 2020-12-18 14:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 35b6ece7b7ac00f660ea20246f4770a0 SHA-1: 97d15ff8327c0a57ed99e652b7fb0a6feaeaa39c SHA-256: 183ebb0d53c23fd6f55acd47487f4fae20f301e480e1a37e69f14b46850fe262
222 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://cctraff.ru/aws?utm_term=ssc+stenographer+2018+notification+pdf`. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs likely intended to direct users to malicious sites. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of multiple malicious links suggests a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/aws?utm_term=ssc+stenographer+2018+notification+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_5f9c0acb3b2fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_5fdc1f108849c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f87a07dd06c5.pdfIn PDF document text
    • https://gapudozesaneg.weebly.com/uploads/1/3/4/5/134525911/7228201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5fb2765b881bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_5f8a6b8fa63f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375703/normal_5fbf4fc2025bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5fce1613b5084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_5f979def88e1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388835/normal_5f9fd32cda4b4.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/baraninezewokavomiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc6afd77848ba205d414585/t/5fc97908fbf8976b723da88c/1607039240949/23811789470.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc37bd13dfdd95b60e57127/t/5fccb86de43f2b00a8a4e02e/1607252080133/radio_five_live_weather_presenters.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc575ad2bbd740658254770/t/5fc815b08bd779356742865b/1606948273874/lafugovopig.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_off0000c7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F4 6008 bytes
SHA-256: 403236562be1d72f74f92bf07a2fbce4612e703b63de5ee91a348279f77aa369
font_01_sfnt_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 10432 bytes
SHA-256: 45da1b3059b71dd12e99547348f35094879f92a6423c41e92120b2d5d2ac3e4a

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