Malicious PDF — malware analysis report

Static analysis result for SHA-256 43de7564658066eb…

MALICIOUS

PDF

85.0 KB Created: 2021-01-05 04:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 24dfa832bb92903a6945d76d180e87fc SHA-1: 5369c50d9ce030dd651aa9e1c5849723ff7a707e SHA-256: 43de7564658066eb32013c14829a777b8fece9119690535df2e75142a37c5d6d
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content or phish users. The heuristic firings, particularly 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM', strongly suggest this malicious intent. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

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://traffmen.ru/aws?utm_term=texas+dps+test+answers In PDF document text
    • https://maxifabosogup.weebly.com/uploads/1/3/4/5/134526580/6398625.pdfIn PDF document text
    • https://voradirara.weebly.com/uploads/1/3/4/7/134744625/xofigekoligofukum.pdfIn PDF document text
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/7232433.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/1067228.pdfIn PDF document text
    • https://poraduke.weebly.com/uploads/1/3/4/3/134385775/toxilog-pazurude.pdfIn PDF document text
    • https://rolafaxamowoti.weebly.com/uploads/1/3/4/9/134903079/dikakunude-galusukiviv-vopibubit-govuwewivogo.pdfIn PDF document text
    • https://jadozuvar.weebly.com/uploads/1/3/5/3/135312187/ecef615f.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/8208948.pdfIn PDF document text
    • https://rezivunafotete.weebly.com/uploads/1/3/4/3/134354631/gusov.pdfIn PDF document text
    • https://luleloneluso.weebly.com/uploads/1/3/4/4/134450102/3596962.pdfIn PDF document text
    • https://mabodezi.weebly.com/uploads/1/3/4/5/134590290/wizigubi-xozanofuzapoto-vamemenu-bofekigidag.pdfIn PDF document text
    • https://figerifefiter.weebly.com/uploads/1/3/4/3/134343277/36cb1.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/bizat_sopeweliruf_xudebidakos_kewezuwo.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/mozirolinitaje/tuvijejonelowiwulud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da37ba58-3db0-4a20-97d1-9253adfe6c96/suxoj.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_off00010ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFC 5028 bytes
SHA-256: 490665f5ea32661a09f5e91cd42cb0486a6567806b576fdb5e2f962861397048
font_01_sfnt_off0001213a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 11300 bytes
SHA-256: 5deb9b6b2a71f08346859011a832809a3813848598e0170f1edb4f34f0fd5912

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