Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2085d10c3cebee0…

MALICIOUS

PDF

83.6 KB Created: 2021-03-07 16:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6932d7e17b10e002602ab8c9fb54ccb8 SHA-1: 139c91575fb3bd0e52119835c203b468505fad83 SHA-256: e2085d10c3cebee06e271873871d5f5dbdfb82dbb26567e29de2d1931c52eaf2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crophysi.ru/strik?utm_term=heat+surge+electric+fireplace+adl-2000m-x+remote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417807/normal_6043201d02210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_6010c511cb321.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/best_marine_biology_books_2019.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/36172641803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494160/normal_5fda618e273a9.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/onkyo_tx-nr686_reset.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496580/normal_5ff0a1cd989fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470685/normal_60054d39c545a.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/63553197873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379719/normal_60245e8382b73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459630/normal_5feb691362973.pdfIn PDF document text
    • http://xoxosedefoxadu.mygamesonline.org/qu_significa_la_palabra_destruir_en_la_biblia.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/one_minute_cure_reviews.pdfIn PDF document text
    • http://tawaguf.scienceontheweb.net/where_does_the_term_arthritis_come_from.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://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_464b4bd02d09400482e484e0401ddcbc.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_553649ecd3a34b44924b0abbd929e7ba.pdf?index=trueIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_cfd1218bccf3448da79d924637bb5859.pdf?index=trueIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_788a5c453dac48c49f2b79b1c9a63c32.pdf?index=trueIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_fe58820db2b140e5835f6934cac62652.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_47061fd7c00d4112ae10dcaba695c7a2.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_44411f3841d14566bc78fdff434d185d.pdf?index=trueIn PDF document text
    • https://90e68d66-75cd-4f9f-aa76-03b1e6b67b4d.filesusr.com/ugd/324cd8_e1c65cd48b684df2ad917eeefe331e15.pdf?index=trueIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_20032ab8311d422ca92948132b9bae14.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 5588 bytes
SHA-256: 5a3f9f812350f08292055c99c3fb7c974e5afb7399af40a3aa3d2bd5abf16382
font_01_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 10852 bytes
SHA-256: 5f3537ae966e72c490755d91bf2f19a8e7b7778cca822e6d7957ec8281f48f1d
font_02_sfnt_off00013275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13275 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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