Malicious PDF — malware analysis report

Static analysis result for SHA-256 370c958db5b01cae…

MALICIOUS

PDF

73.3 KB Created: 2021-01-06 08:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2d20bf370c1a660ed1a96188f67824b1 SHA-1: b8a6addd76954f79ed5219f6c3a5a75bd3c10cdf SHA-256: 370c958db5b01caed0963f6d2e843587d168b5db2431a73ee9c9177b6304a239
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector and a link farm. It contains numerous embedded URLs pointing to external PDF documents, many hosted on disposable domains or potentially malicious infrastructure like traffmen.ru. The primary function appears to be directing users to other malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=wheat+berries+nutritional+information In PDF document text
    • https://cdn.sqhk.co/jaguwubax/hirCfuN/puffin_web_browser_pro_free_ios.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/fibawubaxavuvabu.pdfIn PDF document text
    • https://lilususuki.weebly.com/uploads/1/3/4/3/134317990/fekujudev_zepexus_pofofeteta_xomijakunafapur.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/xorematif-vawelepofijere-mowafet.pdfIn PDF document text
    • https://najunores.weebly.com/uploads/1/3/4/3/134381484/zodidogalukoni.pdfIn PDF document text
    • https://pusixeraz.weebly.com/uploads/1/3/2/6/132681440/kaponivakilux-zijigosa.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/pUhjhc6/nadimokexekebiniw.pdfIn PDF document text
    • https://cdn.sqhk.co/dobexesi/righiBm/lowrider_bomb_truck.pdfIn PDF document text
    • https://gabinabadebaxir.weebly.com/uploads/1/3/1/4/131408928/e1fd64462ca.pdfIn PDF document text
    • https://xinifusat.weebly.com/uploads/1/3/4/3/134321574/zimidoxetavijan_gixudadabanenep.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/nitirew/sony_bravia_40_inch_smart_tv_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/8441618148.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/symantec_dlp_administration_guide_15._5.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_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 5160 bytes
SHA-256: d7a97d4074ef47f9acbeecece439723c5bb9e259b3f9c8c6880b84195f80fa29
font_01_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 10604 bytes
SHA-256: 3c57a42b146df6741c5af036f01a956f71038e3fea3c45d376d9b3f0d461cfe6

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