Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedf3675f9d07337…

MALICIOUS

PDF

74.6 KB Created: 2021-03-22 21:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8ca285426b1f1f9f7dcc6bf21667d3f7 SHA-1: 8875b9b6b798efb3ca6f3134ab873fbbb2e2ed6b SHA-256: bedf3675f9d073373c76e9a2128efcdbdd71f21c3ea8b3d26fd594c2e2b805a0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ponafet.ru/strik?utm_term=how+to+start+windows+8.1+in+safe+mode+from+command+prompt PDF link annotation
    • https://cdn.sqhk.co/nevupediwix/b8jbjro/free_coloring_pages_christmas_lights.pdfIn PDF document text
    • https://mugojilakifev.weebly.com/uploads/1/3/4/5/134510671/3e4e49.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/m3jdifI/kajevusafawamov.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/2030942.pdfIn PDF document text
    • https://tizizuner.weebly.com/uploads/1/3/1/8/131872037/zedikebudel_sovazixigave_fapigisizas.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
    • http://sovizurimi.rf.gd/learn_arabic_language_through_telugu.pdfIn PDF document text
    • http://nibekiwimuzev.epizy.com/chnh_file_b_ngc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b27b846-2ff9-44b3-9a7b-4418e90c7379/how_to_connect_soundpeats_wireless_earbuds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30fce1c8-cb8d-4000-aa75-159e9c680ac9/45333181868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecbb5c71-970e-49bd-bc41-58657f69ea46/dragon_ball_super_manga_colored.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/joduxosemuvisivib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7d963d-92a8-4435-a9a2-b5355afd2382/17244436100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b139f5-6383-4cd0-b3e0-8a31ef4a8fc4/what_is_the_best_rated_portable_hot_tubs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c30879a4-d288-4ac6-a422-85d669097de9/diresa.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/61860664056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b75359-7a35-4ad9-97f4-b6b170f112d6/rabazutasilesesesivu.pdfIn PDF document text
    • http://nisarinu.epizy.com/35453716180.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/aiou_assignments_autumn_2018.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_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 5388 bytes
SHA-256: cae19573916a8166111aead6fc8ec9e2ea4560decc77892c4be9105ee9541151
font_01_sfnt_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 10624 bytes
SHA-256: f6884a17c0f42ed85ade6ef534ee83cdd0d6026fb77829a2067d5b9123663c89
font_02_sfnt_off00010e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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