Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc768a054c21256…

MALICIOUS

PDF

90.1 KB Created: 2021-03-05 03:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 590c19e1e79cfb21a79d079bc417a885 SHA-1: 634d721ce755a5d13532a6314e45c11dcb4dd027 SHA-256: 5fc768a054c21256520c2cad77e14d36925f39622d12551007b8e230d6b9878a
156 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 suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution vector, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/123?utm_term=teledyne+laars+mighty+therm+boiler+manual
    • https://bebujufexuxiki.weebly.com/uploads/1/3/4/6/134624407/460993f.pdf
    • https://zufodivovogopot.weebly.com/uploads/1/3/1/3/131383523/janurapizubetodud.pdf
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/dagebebowamafitoz.pdf
    • http://fruit-citrus.space/6921018854470fk8.pdf
    • http://hookup750.website/81277680103kj4b4.pdf
    • http://finejubopitugov.22web.org/38582719108.pdf
    • https://maxanijalezo.weebly.com/uploads/1/3/2/3/132303118/venukotulu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_1294842da7464ddda0a64b12ccc69159.pdf?index=true
    • https://s3.amazonaws.com/vidadaviwal/477005915.pdf
    • http://ritikaju.epizy.com/dbs_vickers_cdp_linkage_form.pdf
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_764ab9d1cc81494bb96ee4acc541a207.pdf?index=true
    • https://s3.amazonaws.com/bojafazes/vba_excel_tutorial_for_dummies.pdf
    • https://s3.amazonaws.com/dejolavubukugeb/research_paper_outline_template_chicago_style.pdf
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_2c1ea2a29e9f4daaaf11cd76b7e7ce3c.pdf?index=true
    • https://s3.amazonaws.com/veraxawewib/how_many_steps_do_i_need_to_lose_weight_chart.pdf
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_028d9e168f004823b703881f62fcfe3c.pdf?index=true
    • https://s3.amazonaws.com/gixirojozogufux/rojadiwimimezewi.pdf
    • http://nefaped.epizy.com/gafuvi.pdf
    • https://s3.amazonaws.com/womirofop/kuxosivikulosebunusil.pdf
    • https://s3.amazonaws.com/jitimesolagun/kuxekosu.pdf
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_3429aaeb6572401c8e56cd998157a74b.pdf?index=true
    • https://s3.amazonaws.com/gonima/rstudio_cheat_sheet_ggplot.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001214f.bin
e59c7fbdbc1324f976f3d3e38fb30074ad659c6d092d440ee25a81c9cc156e62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 5432 bytes
font_01_sfnt_off000133a2.bin
d0d1c85fc33298cefbd1803f50a3e699fd634224db764371d17b22bf351b9a61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133A2 10968 bytes

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