Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a2f4dfb35b2327…

MALICIOUS

PDF

76.6 KB Created: 2021-04-05 05:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7867c61288cc24f27f6555d1a05e4faa SHA-1: 9a414c6b37815560b5fd2394ba728ec75dac3256 SHA-256: 27a2f4dfb35b232701d6243544b124f13c746eb0ec5819c3a462328c8999828b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, but no clear instructions or lures are discernible from the readable portion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/strik?utm_term=how+do+i+pair+my+jbl+flip+2 PDF link annotation
    • http://shopmzm.site/ecommerce_logo_ideasr9o4n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473415/normal_6052a358b6dcc.pdfIn PDF document text
    • http://eurostore.info/mayabazar_telugu_movie_video_songs_freez2o78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_60659820aacdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_6020310399b0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505687/normal_600fc2fc266d0.pdfIn PDF document text
    • http://vudasuti.mygamesonline.org/11_plus_synonyms_and_antonyms_worksheets.pdfIn PDF document text
    • http://covid-19online.site/clarins_manual_auto_lifting_methodn8etm.pdfIn PDF document text
    • http://topsol.xyz/anti-_inflammation_diet_and_recipe_book335c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497658/normal_5fe9343f47551.pdfIn PDF document text
    • http://memimusisat.getenjoyment.net/personal_trainer_job_description.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_6036a35ce3362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_603181f7b6a39.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/nabijerokuwutakulupoganob.pdfIn PDF document text
    • http://lovechat24.club/hyperkalemia_guidelines_treatment3ai8n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_28b0f16a05ac4637a949497eb3a4f5e5.pdf?index=trueIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_a5a06fcd80ae4dc6b0ea8dae905c6846.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wegugus/dakate.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/samsung_j7_prime_2017_android_9.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_ea9b08df4fe040cc84770a15fb70664a.pdf?index=trueIn PDF document text
    • http://jubogaju.atwebpages.com/vivitar_dvr786hd_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/scag_v_ride_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/99923723597.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/bittorrent_pro_for_pc.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_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 5512 bytes
SHA-256: dffd24a575328cc4c846d0ddcef1adaeee6bdea96ad0ec174f484ff5a34fd40c
font_01_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 11064 bytes
SHA-256: f43a98d105ab8f4f009a63783971a79a75471a16c56a1a06f02c72fef2e41dd9