Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eef020bd8bf0e61…

MALICIOUS

PDF

78.8 KB Created: 2020-11-26 01:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 72795f366100306164a87700ede7ed2f SHA-1: 971664366be9dcf3baf49da735c360b8661a4515 SHA-256: 6eef020bd8bf0e6142842e3dab14b9ccd83898e92d7f4b6e52b8aa0f2d5d2f2d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains multiple embedded URLs, with at least one identified as a malicious redirector. The heuristic firings indicate it's a malicious redirector and part of a link farm, suggesting an attempt to drive traffic to malicious sites. The ML classifier and ClamAV detection further confirm its malicious nature. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest it's designed to exploit vulnerabilities or lead users to phishing/malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=diagrama+de+transmision+automatica+jetta+a2 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408582/normal_5f97b0dfa3d65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_5f9a0429b5369.pdfIn PDF document text
    • https://zobirifojufegot.weebly.com/uploads/1/3/4/3/134374070/kawodirim.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/gipij.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/jarirotexab/73538649931.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/azur_lane_apk_black_screen.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/98698344403.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/cdf_and_in_statistics.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/bses_duplicate_bill_download_delhi.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/avidemux_portable_free.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/98164510327.pdfIn PDF document text
    • https://s3.amazonaws.com/mupakijivuruzim/pro_proportionate_crossword_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/joining_report_letter_for_assistant_professor.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_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 5432 bytes
SHA-256: 3fe587f34b29bb2ed3b2fd94f237a202a1bb439410c94b9692a1541a70f641c0
font_01_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 11108 bytes
SHA-256: ef9e14e6da1cb4d567d954f589e4f0dacb21e36febda739d0724948b31e343b4

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