Malicious PDF — malware analysis report

Static analysis result for SHA-256 31be1a206e6ce3fe…

MALICIOUS

PDF

85.9 KB Created: 2021-03-30 16:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9225353a63e0f68825ed2e1688e7a19f SHA-1: 4588685af08ed384f0727e8c35a04c2ce14ff158 SHA-256: 31be1a206e6ce3fea8620161975ddce83701e86f29bc8d71c6e660fb28d963fb
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 of which point to other PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, https://zajinet.ru/strik?utm_term=defensive+driving+quiz+answers, indicates a lure related to a quiz. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=defensive+driving+quiz+answers
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/2896068.pdf
    • http://pozuliruz.iblogger.org/left_behind_film_series_cast.pdf
    • http://pifanaliriwabo.mygamesonline.org/adenoma_hipofisario_en_nios.pdf
    • http://fadulifakibul.medianewsonline.com/jaloraju.pdf
    • http://jerimujolegem.medianewsonline.com/brer_rabbit_stories.pdf
    • http://fikosarodone.medianewsonline.com/radio_shack_mpa-250_owners_manual.pdf
    • http://zurufarovosu.iblogger.org/fobegamem.pdf
    • http://texoraw.sportsontheweb.net/wutilulawobulivovip.pdf
    • https://vusejamujaled.weebly.com/uploads/1/3/1/4/131437056/naxeg.pdf
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/8561055.pdf
    • https://xidoteruredogon.weebly.com/uploads/1/3/1/4/131454367/3c40f52a409034.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/44f35e08-c4ce-48f3-8022-b123b453ce9c/rafitobefemo.pdf
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_559aea9c29924d08985506322c3ce925.pdf?index=true
    • http://numivonef.rf.gd/96899701778.pdf
    • https://s3.amazonaws.com/jiwisi/pikasiralubunuk.pdf
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_778d7f0068de4f5186e5daf20dd3a347.pdf?index=true
    • https://s3.amazonaws.com/selivuvumepaveb/what_is_a_gum_pocket.pdf
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_5e9033c9d07e419e80daa1b25f652bec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/31dd120d-3528-42cb-bf4e-710849d76c63/91888947252.pdf
    • https://s3.amazonaws.com/gawabog/what_is_the_highest_rated_french_door_refrigerator.pdf
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_2f825533b68f4798aca6406dbeb97404.pdf?index=true
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_92012c9b3c374178b125a8d72afebc86.pdf?index=true
    • https://uploads.strikinglycdn.com/files/da90d02f-7af7-4fce-912d-8d5d6ea3f353/whered_you_go_bernadette_movie_where_to_watch.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb3.bin
e2ec9356d263ca25091c2aa91515cc25f257650f7432ef0413302ad57fa2ef74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 5372 bytes
font_01_sfnt_off00010e22.bin
134061f49dd2ae6472128b860f26973c0f4fbd1034607eb3a90a586a682d4c30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E22 11656 bytes
font_02_sfnt_off000134a8.bin
cc032a1d7efe9f52c63bdca4360dad9aff78fb14a47167d9e0089e6cc9416013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134A8 16232 bytes

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