Malicious PDF — malware analysis report

Static analysis result for SHA-256 14fc499dfd67755f…

MALICIOUS

PDF

71.5 KB Created: 2020-11-14 16:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3e8ab87873e756db77c2f6ed6729e290 SHA-1: 18460a485e79fbb15e67c37efa38a5ba067a5866 SHA-256: 14fc499dfd67755f301b64f5be3c0188b63e3370fde52420881211d6fbb11a46
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external websites identified as malicious redirectors or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The primary attack pattern involves redirecting users through a chain of links, starting with the initial malicious PDF.

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.
  • 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.
  • 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/strik?utm_term=kero+sun+kerosene+heater In PDF document text
    • https://sadakijawezawu.weebly.com/uploads/1/3/4/5/134595959/0cb799c98826c.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/869970.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/1719ffc.pdfIn PDF document text
    • https://zakiguranul.weebly.com/uploads/1/3/4/4/134480990/gosejepiludet.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/7989682.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/kutimamovux_defusafun.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/75c4dd.pdfIn PDF document text
    • https://jebezowurexa.weebly.com/uploads/1/3/4/5/134576847/limutoselavuren.pdfIn PDF document text
    • https://kirugalepolofaw.weebly.com/uploads/1/3/4/3/134340862/9007502.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f704b7d9-3c84-40e2-af05-0b5a241dcf43/fudoxoselidubomenagow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ffc260d-a8e5-4a48-b66b-97839f41200f/87168053678.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/wym_in_texting_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dfb791b-31a7-4127-b5ed-e45151a6d700/jivekofifugojizebudevo.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/39264731421.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB1 4608 bytes
SHA-256: 2509816ea627f205df20f12561c71e559a436569c50ed1475baa08f483a36dc3
font_01_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 10592 bytes
SHA-256: 6ac625b579875fe8dae44a94446af6240bae34dbb0feab5a0e6f1b8b97d573fb
font_02_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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