Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1efe40468a353ba…

MALICIOUS

PDF

85.4 KB Created: 2021-01-24 11:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8651d5d3f7eabbb93d71204c86e4bc47 SHA-1: b7d172202f2b70acc21ab49bd73fe5d0da5b899e SHA-256: d1efe40468a353bab278111084ac42e71735f6cd6d861502272b5a3ad23866f9
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous malicious URLs suggests an attempt to redirect the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://yafferge.ru/123?utm_term=baseball+bat+standard+width In PDF document text
    • http://regsenatvumen.website/sceptre_tv_32_inch_reviews4zog9.pdfIn PDF document text
    • http://dreamingdeveloper.com/jumia_black_friday_uganda_20194mxio.pdfIn PDF document text
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/nisel-javukufivaruweg-kifoxut-dejiwerot.pdfIn PDF document text
    • https://petugaxuw.weebly.com/uploads/1/3/5/3/135397026/95e48c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367938/normal_5ffd9e392bdd7.pdfIn PDF document text
    • https://ganipomadajo.weebly.com/uploads/1/3/2/6/132695424/713fc0da.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/semapavijedadef.pdfIn PDF document text
    • http://ontrade.top/assassin_s_creed_identity_offline_gameplaywdvst.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/f0ea40233b63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485826/normal_5fc66c0f998b7.pdfIn PDF document text
    • http://lomags.ru/wawubasiteribopus0p.pdfIn PDF document text
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/wetugiteleziwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370987/normal_6008923dd558d.pdfIn PDF document text
    • https://tapukinag.weebly.com/uploads/1/3/1/6/131606864/metedukidupobuvot.pdfIn PDF document text
    • https://tonakojevidi.weebly.com/uploads/1/3/0/7/130775970/pomugixuvonogi-rugiwixujo-migojimulov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412387/normal_5fdcbb1e4b76b.pdfIn PDF document text
    • https://nudadisaxoge.weebly.com/uploads/1/3/4/0/134018155/lejasemuriputidal.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://ladorum.epizy.com/do_naina_angamaly_diaries_ringtone.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/retrieve_deleted_text_messages_android_free.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_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 4872 bytes
SHA-256: c38c3d64676090ffc46c015b0da5de5c6b320d13efb81594055f066b79a07d22
font_01_sfnt_off0001132f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 11536 bytes
SHA-256: deb0c692f1397c23a993612b82120964b8ba00e3f76f1e5d540e1d0fda6e3534
font_02_sfnt_off000139e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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