Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ce3bd1660f8bab…

MALICIOUS

PDF

69.1 KB Created: 2021-03-28 06:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bb7571cf1dad27a8bc849bea5de14c7 SHA-1: 299f394fe5f78420ac6f4d0bdab46e394f201f0f SHA-256: 07ce3bd1660f8bab52d4629043fc7e270184de2a3d79305c35353ba325e64c96
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are SEO-optimized and point to seemingly unrelated documents, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to phishing or malware-hosting sites. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=caltrans+safety+manual+chapter+7
    • http://mijuxub.66ghz.com/kaketinewilesupu.pdf
    • https://fakosizok.weebly.com/uploads/1/3/0/8/130813800/aba51b1c63586.pdf
    • https://tomavibevojivow.weebly.com/uploads/1/3/4/0/134016690/winotajaz.pdf
    • http://beritox.medianewsonline.com/anamnesis_psicologia.pdf
    • https://cdn-cms.f-static.net/uploads/4405652/normal_601453f932409.pdf
    • https://jubaluwaruzazux.weebly.com/uploads/1/3/2/7/132740890/jotokixekovugu-nasopevukamil.pdf
    • http://jigitozunawada.66ghz.com/fomizixemodozas.pdf
    • http://xuwuvewisin.mypressonline.com/nidowetowagaz.pdf
    • https://cdn-cms.f-static.net/uploads/4407064/normal_60357c3299665.pdf
    • https://cdn-cms.f-static.net/uploads/4413564/normal_6011e07555f1c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_1debbe88dac3465f9b59a1a4f43766b4.pdf?index=true
    • https://s3.amazonaws.com/gotenukevepunin/master_plan_template_ppt.pdf
    • https://s3.amazonaws.com/kikunojulejuj/alta_via_2_valle_d_aosta.pdf
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_4271a13b7b254c71972b0cb10d2277be.pdf?index=true
    • https://s3.amazonaws.com/xefezesebusu/toefl_ibt_listening_practice_test_free.pdf
    • http://xitamedasunur.rf.gd/what_comes_with_ps5_digital_edition.pdf
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_972ed43468f04412aa1a88fa9bc73a3b.pdf?index=true
    • http://pudawetik.rf.gd/66331278939.pdf
    • http://pasezuj.rf.gd/warexu.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_off0000d0e8.bin
abf5aafe0a674cf1db2590a9c8a6d9211a322b95648bb053a02752e8e1a1e146		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E8 5344 bytes
font_01_sfnt_off0000e2f7.bin
662ff143ef33958f34ffe71f9b6e501e7e1a89554f2a981a13cb56de83198a01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 10536 bytes

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