Malicious PDF — malware analysis report

Static analysis result for SHA-256 be59a133a75e9435…

MALICIOUS

PDF

80.3 KB Created: 2021-03-05 18:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 9a2ed8a0b278c058e57b606c7fc02d82 SHA-1: f01ff79893f22044c722e28717e14d36b3ee2819 SHA-256: be59a133a75e9435e178cd6963e0f74c3a7152a075a42728246468bde414fa81
186 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 hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious redirection and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://botokaw.ru/strik?utm_term=how+to+replace+batteries+in+a+fossil+watch PDF link annotation
    • https://cdn.sqhk.co/sovajepuxe/jhXgdjf/72707054284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_5fe8d34645d83.pdfIn PDF document text
    • https://xerazagas.weebly.com/uploads/1/3/0/8/130813913/dukazaxojanoto_rewuxukaj_jusewidevudila_lufazugelozike.pdfIn PDF document text
    • https://folowobudeguw.weebly.com/uploads/1/3/6/0/136051819/tivilol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486193/normal_5fc64c65c5316.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/hd7Tgex/9145847644.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5fe36d82cbaf4.pdfIn PDF document text
    • https://cdn.sqhk.co/dokamaruxif/GhjjbTY/pedometer_step_counter_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/Euf8giO/multiplayer_for_minecraft_pe_mcpe_servers_apk.pdfIn PDF document text
    • https://vigoruso.weebly.com/uploads/1/3/4/1/134131386/adf29.pdfIn PDF document text
    • https://cdn.sqhk.co/vekazedivipi/PQUighh/juventus_jersey_2019_adidas.pdfIn PDF document text
    • https://cdn.sqhk.co/kuruwoke/aUicEia/nibikibi.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/e4d0617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492915/normal_6013c39998262.pdfIn PDF document text
    • https://sedivunoruset.weebly.com/uploads/1/3/4/8/134859312/vajawafogoz-loteno-rudokezawetul-vopirewo.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/Agehige/ww2_battle_simulator_unlimited_gems.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/0hbpeid/save_the_fish_vegetarian_sushi_kansas_city.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454966/normal_5fdfadc3af915.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://s3.amazonaws.com/vinejivunitego/27291228352.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_47d057b4d5884a82b831092cccd9a77d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zakunafu/8821973362.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_96ab8c83f24d46a8bbc74f3047f4310e.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_4e36b15386e5406381c3b579259b7f4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/55784299263.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/gutusegomadomofu.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_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 5084 bytes
SHA-256: 34c3502930b9c91de75044c2b606d17ed560c8a29cb617b69f10f36a5abc829a
font_01_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 10664 bytes
SHA-256: ceeb99e5ad8a48e538bec9e8f207aa6021c5c4fd66ed5c76099e0a99b008b175
font_02_sfnt_off000124fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361