Malicious PDF — malware analysis report

Static analysis result for SHA-256 de36af82b152ecd4…

MALICIOUS

PDF

94.3 KB Created: 2021-03-03 03:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: da6e5790fa3722530e1d59a4034db87c SHA-1: d0e95195de0e114b91848f0cad6389729bead651 SHA-256: de36af82b152ecd40e4c5782adc544f2c1903b6bbd3230f3d7773200747de40d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, https://midufefew.ru/wix?keyword=hp+camo+laptop+reviews, is directly associated with the file. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware via these links. No scripts were extracted, but the PDF structure itself is weaponized.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://midufefew.ru/wix?keyword=hp+camo+laptop+reviews PDF link annotation
    • http://beviluxenumiliv.mywebcommunity.org/82707797209.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/wVhDrgg/43803158911.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/wings_of_fire_book_5_graphic_novel_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/cFEjds3/pokokiwoxezofadule.pdfIn PDF document text
    • http://vanibunogi.iblogger.org/sarojuvasa.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/54347575260.pdfIn PDF document text
    • https://zelowomuguzak.weebly.com/uploads/1/3/1/3/131379017/vonogasi.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/ieZpUYO/99590038448.pdfIn PDF document text
    • https://dexanefuv.weebly.com/uploads/1/3/1/3/131383512/477918.pdfIn PDF document text
    • http://wopexobow.mywebcommunity.org/49114828127.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/hdjg0Ju/lagamufulipu.pdfIn PDF document text
    • https://cdn.sqhk.co/rujamuzizogo/fqjcn4z/free_wallpaper_for_computer_halloween.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beluguliwiwe.epizy.com/91046603665.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/barbara_marciniak_bringers_of_the_dawn.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/abrahaminte_santhathikal_song_maango.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/6826288353.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/how_to_replace_beats_solo_3_ear_pads.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/star_trek_the_next_generation_episodes_with_the_borg.pdfIn PDF document text
    • http://dipumekamerara.rf.gd/walmart_application_quiz_answers.pdfIn PDF document text
    • http://xegubidutanaza.epizy.com/bleach_brave_souls_build_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/nutesirusaraduvaxan.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 5192 bytes
SHA-256: b3472295a4ccccb3e9106b6112ebffaff988431eed40b67adf36749372b2b6f0
font_01_sfnt_off00012dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFC 11916 bytes
SHA-256: a63dbbb0106fc649b93cbfbb1fe8e56729fa72db23bc76a8ba034bcf1f906c83
font_02_sfnt_off000155e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E1 16392 bytes
SHA-256: 8d9529fca8e49fd747a132c86257b3f003f6793d9f50918e3e02e184cbe99d44

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