Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ae2b8431654101…

MALICIOUS

PDF

108.2 KB Created: 2021-05-18 09:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8e1c92ef353c4ea0ec3d06dbecd41ca6 SHA-1: a133ced443ce593cdc80cab9060b916610259076 SHA-256: 26ae2b8431654101afe680b551d6855d4379c3380d8dce5ce57de8975107807f
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL and the document body's question serve as a lure to encourage users to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/strik?utm_term=what+are+the+electronic+configuration+of+first+20+elements PDF link annotation
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/685988.pdfIn PDF document text
    • https://gifefetetax.weebly.com/uploads/1/3/4/8/134899892/xubujizu.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/borup.pdfIn PDF document text
    • https://zoxobafibo.weebly.com/uploads/1/3/4/2/134235835/a7832b1d.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/e3d1887.pdfIn PDF document text
    • http://bizuzagewad.iblogger.org/sazofes.pdfIn PDF document text
    • https://rusakubasarozu.weebly.com/uploads/1/3/4/2/134266120/ropijamaz.pdfIn PDF document text
    • https://webesetumisurut.weebly.com/uploads/1/3/4/3/134318687/951d43465393eb.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/57c661.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/e7d5c17b-26f1-494f-ac05-80e664845b65/gatuzomurufokirumeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdb45c89-22a5-456e-872c-b91b99a1201e/17458850484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00006c07-1565-48af-93d2-c099e7905453/124059285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0948772-23b1-461c-a01f-9d33973ac9f8/kenmore_he3t_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f7a083b-dddd-45d1-aa5f-b89e4ce1fad8/77981114577.pdfIn PDF document text
    • http://sepotoxofuzeju.epizy.com/zagalugagel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74373cef-a90a-4122-95c1-b1fe1923f2ee/what_is_the_best_long_pole_hedge_trimmer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09331bf7-228f-4f33-844c-527f10854ade/linear_algebra_s._friedberg_aj._insel_l._spence_fourth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff09947d-1fc7-4c3d-83bc-013127c9b880/casio_illuminator_price_in_ghana.pdfIn PDF document text
    • http://fafiwokewe.epizy.com/86808533660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4c24ba-e8d9-4e0d-9c4f-d1553461e29c/harrison_bergeron_by_kurt_vonnegut_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa40f41a-95f2-4d7e-8ee2-f0d3c88b155e/60663888095.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_off00015b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B8B 5464 bytes
SHA-256: 2a5d9c5953e4d7ebbd8b4de84ec065cb89d84d53ffe8fa33e454bf959f6421e4
font_01_sfnt_off00016e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E01 11204 bytes
SHA-256: 49286444ec3e368539fbaf450347e2454eb81c16360047358c1756c135a24d67
font_02_sfnt_off0001943f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1943F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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