Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a4f18ed09cde68…

MALICIOUS

PDF

70.7 KB Created: 2021-01-18 23:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a735743e4a3de1b0081d702225476b76 SHA-1: 200dd9777c8d7bbc350fa16a9f9ae63527a4ebfa SHA-256: 94a4f18ed09cde68da4d5c28fb5312f8334239a4fca45daf4511db01657f7e18
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, and at least one link points to a known malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://crophysi.ru/123?utm_term=nervous+system+concept+map+answer+key In PDF document text
    • https://kerizivol.weebly.com/uploads/1/3/4/6/134665291/likok_susoxirijewa_bojin.pdfIn PDF document text
    • https://site-1171591.mozfiles.com/files/1171591/telexujidux.pdfIn PDF document text
    • https://pisawaramas.weebly.com/uploads/1/3/4/6/134685908/kitosakukogazoj.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/mijexoken-xisiserad-juwakokeriw-gobuwudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426075/normal_5fbacc7da90bc.pdfIn PDF document text
    • https://site-1177476.mozfiles.com/files/1177476/31707769574.pdfIn PDF document text
    • https://site-1171554.mozfiles.com/files/1171554/yellow_pages_business_sign_up.pdfIn PDF document text
    • https://site-1180710.mozfiles.com/files/1180710/potup.pdfIn PDF document text
    • https://site-1221616.mozfiles.com/files/1221616/bethlehem_college_uniform_shop_times.pdfIn PDF document text
    • https://rugufixib.weebly.com/uploads/1/3/4/3/134381394/tojapibasejud_fuvusovowezejef_sabofefi_tetodaguva.pdfIn PDF document text
    • https://kivifakan.weebly.com/uploads/1/3/4/8/134870172/b4252768.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/xumakomowi/redemption_manual_4.0.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/direct_reported_speech_ks2_worksheet.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_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 5336 bytes
SHA-256: 20cc6d467131630e83287c7c538b4b88a78209f2ccf9391f9c5b17d43a0797c2
font_01_sfnt_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 10164 bytes
SHA-256: dd93623a4ece50da22ff49daebad105cbbbeab649b50aa3cdbf6c6ee777c0238

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