Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f038ab51f88a9d3…

MALICIOUS

PDF

75.4 KB Created: 2021-01-09 17:35:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e0eb715333e3a3e6ccb8ac9bf36d8b46 SHA-1: dce37089a95df6dc12cbd0ffd8fabb4e45c35c9a SHA-256: 2f038ab51f88a9d3e91fb4c3e5dc7182694a0475d1a059c62b81bac776d2b71c
252 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 domains and are likely part of a link farm designed to redirect users to malicious sites. The heuristic firings indicate the PDF links to known malicious redirector infrastructure and is flagged by an ML classifier as malicious. The document body, though heavily obfuscated, contains text related to 'authentication' and 'eligibility form', suggesting a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=authentication+of+csc+eligibility+form In PDF document text
    • https://zudiwimuda.weebly.com/uploads/1/3/1/4/131438079/gomidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_5fb3588635306.pdfIn PDF document text
    • https://gewedawinun.weebly.com/uploads/1/3/4/7/134745389/bolopopasenar_movidafefowivoj_bafapu.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/iQhiIij/titan_quest_ragnarok_review_pc.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/6587894.pdfIn PDF document text
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/xemuti_kovitekojikaf_zabojiworenibub.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/xosoxisije.pdfIn PDF document text
    • https://xugilatopuke.weebly.com/uploads/1/3/4/7/134746985/9ecf1.pdfIn PDF document text
    • https://gudowujenur.weebly.com/uploads/1/3/4/3/134341832/727036.pdfIn PDF document text
    • https://xeforosoxipu.weebly.com/uploads/1/3/4/9/134900432/mekabimagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410015/normal_5fb91df53eae1.pdfIn PDF document text
    • https://wilaruxade.weebly.com/uploads/1/3/4/8/134865150/5533726.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://s3.amazonaws.com/bivanud/english_guide_for_class_9_sindh_board.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_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 5408 bytes
SHA-256: 462c3d97283320f8c20033cf53fcb491657ea1f988b102c9f204e27cdbfb3950
font_01_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 10720 bytes
SHA-256: fa3aa40426b4bda6c074411c2162d327f33e49235aff4928a9fa93b038215b7f
font_02_sfnt_off000112b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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