Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f8344f2436c27c…

MALICIOUS

PDF

100.5 KB Created: 2021-03-27 11:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cc2a194d8018b06237049be431c15d64 SHA-1: 9ce08c9d2ebf611a4d5fee9f8f223ca6c25b172a SHA-256: 90f8344f2436c27cf24a2f27f2bad8d1e98f8d2e1f5e89361e933768bd68c245
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://lozipotod.ru/strik?utm_term=cell+1st+form+lr+build PDF link annotation
    • http://suxiselukex.66ghz.com/96130218951.pdfIn PDF document text
    • http://nelominukosulug.iblogger.org/84737282442.pdfIn PDF document text
    • http://wukilirukorobow.iblogger.org/what_is_multivariate_analysis_in_research.pdfIn PDF document text
    • https://cdn.sqhk.co/lukisebeka/Xji7qH2/throne_room_lyrics_kim_walker_smith.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/jjiuijd/to_do_list_app_android_sync_with_pc.pdfIn PDF document text
    • http://lawobusupovapuv.22web.org/intermatic_t101_clock_not_working.pdfIn PDF document text
    • http://xuzugukow.iblogger.org/79658691462.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/ibuhae1/40835755681.pdfIn PDF document text
    • https://cdn.sqhk.co/femokuxajuz/MibjjFy/xbox_one_console_black_friday_2020.pdfIn PDF document text
    • http://tesepaxe.iblogger.org/20156906001.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_75241691ac324e2d8e739e1d6518c343.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81e9f6a-4a56-487d-bc1b-16bc41590b47/sufona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6142688e-d99a-458c-a5b4-f06093f81054/nakalawekibagusakad.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_47abf70564b6428db0ebd1fed37ef199.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_f470665c412344728190453f26c41d15.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ef0da9-d6ad-4c57-88cc-86cf5af657a0/what_is_the_difference_between_description_and_narration.pdfIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_79522e739a24425eb1bb16f64c3496c1.pdf?index=trueIn PDF document text
    • http://tokofelutuj.epizy.com/koropavemonipoxow.pdfIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_7e61f304079e4576a0d6ae3aa9880fab.pdf?index=trueIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_aad51f6cde8243b0a7df29ef5681eecf.pdf?index=trueIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_cd96d30d993646958bc08e739173727e.pdf?index=trueIn 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_off0001472f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472F 4940 bytes
SHA-256: 66095ce9fc47eba9a6cf34bc454bc0ffa1cd1d0e3a23044cfdc13193391e3c59
font_01_sfnt_off000157e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E3 13072 bytes
SHA-256: 04eaa02dd3c18b27ddcef48657763eaa3b7c97131fe0083548c82bddc4fb1d0a

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