Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7e6b6263907f12…

MALICIOUS

PDF

68.1 KB Created: 2020-12-27 05:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 46d29954bee0f8be88d337d4203160b0 SHA-1: 2a316b7bc40ac21d8963ac54172a0c4646678a15 SHA-256: bb7e6b6263907f12816d6a1c0365d7bb6fe0fe80f54daa0cc23b1755ce893113
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and an ML classifier, indicating it's a phishing or redirector attempt. It contains a large number of embedded URLs, forming a link farm designed to direct users to potentially malicious sites, one of which is a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'math answer key lesson 8'.

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://ggtraff.ru/123?utm_term=faceing+math+answer+key+lesson+8 In PDF document text
    • https://tokemenar.weebly.com/uploads/1/3/4/3/134337898/naluraroforok.pdfIn PDF document text
    • https://lozuninusagutog.weebly.com/uploads/1/3/5/3/135309735/fomiroviremirusuf.pdfIn PDF document text
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/c7ebd5a0dbd65.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/resujedefovalex.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/af6a6.pdfIn PDF document text
    • https://bofazereb.weebly.com/uploads/1/3/4/6/134675062/pigivagolap_kosiganevenu.pdfIn PDF document text
    • https://nipifofopofeduv.weebly.com/uploads/1/3/4/3/134338269/foxowagije.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/d69a71bc-7461-48ea-8d6d-9bd576df9b1f/cat_in_the_hat_face_template.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/xasolufobepopoxixotomo.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/definition_nonconformity_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d597357-0ca2-4ffb-8cbf-ee7bc466c9ae/30621702060.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/d_d_4e_paladin_guide.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_off0000beee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEE 5408 bytes
SHA-256: 990ab0b182bdb80b36eaa2ded9c9b73a5b07c8e032c647854ba20718ae2be221
font_01_sfnt_off0000d131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD131 10568 bytes
SHA-256: d00d726cf46399c43ccecc034fa52e27f614a7ce0caa69c2e3d08f5d58f43903
font_02_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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