Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8df3d633dce3f66…

MALICIOUS

PDF

79.6 KB Created: 2021-03-12 09:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aaf94ba16e42b5d79053ca94d15b084 SHA-1: 1a717102c49708802e4548a996320a78e9f5578a SHA-256: d8df3d633dce3f66e3aef5ccc752b3301675a45d2c9d5e908bdd7f92084020b8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, suggesting it is part of a link farm or SEO spam campaign designed to drive traffic to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=types+of+electrical+cables+and+wires+in+pdf
    • https://pipokusu.weebly.com/uploads/1/3/3/9/133997176/vusexotisivezo_zetodizexed.pdf
    • http://nesibobivugo.iblogger.org/27799015376.pdf
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/ravinenitif_tusopip_kaxub.pdf
    • http://wogivodugakovek.mygamesonline.org/the_ashley_book_of_knots_free_download.pdf
    • https://sefezepijimife.weebly.com/uploads/1/3/4/7/134733313/77636d0b7bcf.pdf
    • http://suzupuwejal.mygamesonline.org/5e_descent_into_avernus.pdf
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/zusen-mukerabuv-waputinikufot.pdf
    • https://voranafirodibug.weebly.com/uploads/1/3/2/6/132696030/verewutiwaxexuzewigo.pdf
    • http://fikitenifazela.iblogger.org/zuvawubisobumizefo.pdf
    • https://bazodezivif.weebly.com/uploads/1/3/6/0/136088162/nasefoviwuvituwim.pdf
    • http://vizexibidoxi.getenjoyment.net/ganur.pdf
    • http://lapitubemexidi.mywebcommunity.org/haier_portable_washer_drain_hose.pdf
    • https://bupekotarox.weebly.com/uploads/1/3/0/7/130739944/xikikofozosatetitiv.pdf
    • https://dulipitigisol.weebly.com/uploads/1/3/4/7/134717891/9b595411c3.pdf
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/2162954.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tutakaxebi.epizy.com/how_to_dating_girl_online.pdf
    • http://mibelajute.epizy.com/australia_time_date_format.pdf
    • https://s3.amazonaws.com/bisegilupuf/salesforce_attach_to_email_template.pdf
    • https://uploads.strikinglycdn.com/files/468941aa-d221-4ac5-8fbf-d962a5c55cee/32704036595.pdf
    • https://s3.amazonaws.com/xanunafojuloki/samsung_3d_sample_video.pdf
    • https://uploads.strikinglycdn.com/files/b8503973-c591-4bb4-a451-388c100411cd/galinijobu.pdf
    • https://s3.amazonaws.com/xelimewat/57974688464.pdf
    • https://s3.amazonaws.com/rogugagatuf/punaxamazut.pdf
    • http://mawidinivetobi.myartsonline.com/moto_g6_plus_wireless_charger.pdf
    • http://donekik.rf.gd/aikido_martial_arts_techniques.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_off0000fa44.bin
208a1c0a341946fb991064ad1fd3fdb7bf208a210ea17694f068c50a4b1ebe2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 5432 bytes
font_01_sfnt_off00010cde.bin
29ea9c9d30bd53e56d7a7b7826e73150d9c9d0a102bab834d081fc426a37c7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 10412 bytes

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