Malicious PDF — malware analysis report

Static analysis result for SHA-256 1747c7f13cdcac62…

MALICIOUS

PDF

91.1 KB Created: 2021-03-19 19:01:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e767f56485c1e6792e792192ab00b008 SHA-1: 9c1957a72fbf2d3b5e6aace7bb8cca1c21c59598 SHA-256: 1747c7f13cdcac62817436f3b42b76c79608fe2581125873ed01aab0176fff43
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/aws?utm_term=what+is+the+role+of+criminal+justice+system PDF link annotation
    • https://gunujudota.weebly.com/uploads/1/3/2/3/132303168/golukavavu.pdfIn PDF document text
    • https://cdn.sqhk.co/vomuvojovi/jdFicgf/volvo_bus_game_free_for_mobile.pdfIn PDF document text
    • https://numobokofe.weebly.com/uploads/1/3/4/5/134501802/joguxe_rukefoziluj_kokotiwutukaw_romunemaj.pdfIn PDF document text
    • https://cdn.sqhk.co/goropakuvoge/jf4icgc/38613976712.pdfIn PDF document text
    • http://zipogagu.iblogger.org/path_of_exile_blight_map_guide.pdfIn PDF document text
    • https://detubutil.weebly.com/uploads/1/3/5/3/135348338/4315061.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/gelaboguwonibasadu.pdfIn PDF document text
    • http://viteroludobano.mypressonline.com/how_to_play_company_of_heroes_2_lan.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/Goghia3/77514804334.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/4hahbGG/kesowenulinavemo.pdfIn PDF document text
    • http://xakaderinetatu.mygamesonline.org/68138849117.pdfIn PDF document text
    • https://pujowuvorokom.weebly.com/uploads/1/3/5/3/135347933/jaluw-tugifanoxowel.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/Sy5hjCv/aces_of_the_luftwaffe_squadron_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c0db550-2e77-4983-bc2a-4fb98b0d7918/95939654194.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_1d19b33325704f1f8f1e014120b84bd6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c86426c-c5e0-47de-baa3-c4da667a3dd1/16689425400.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_5dc209f986ab407a8d8141bd56fd07cc.pdf?index=trueIn PDF document text
    • http://tizelimanux.rf.gd/information_retrieval_journal.pdfIn PDF document text
    • http://lakasixes.rf.gd/attack_on_titan_season_4_episode_4_manga_start.pdfIn PDF document text
    • http://zijedan.atwebpages.com/hp_envy_not_printing_alignment_page.pdfIn PDF document text
    • http://wafazitowem.rf.gd/20982513481.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_1b289c45c2864baeadf474214e8401d1.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001250a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250A 5312 bytes
SHA-256: 86a0ad316f3408d291a0e219469cc5fb89b52578e4dec6513b8f464cc7e49385
font_01_sfnt_off00013705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13705 11908 bytes
SHA-256: 3513999f4c1f32b0fbc5c64b8ae018d47b94f4500a13d7245120e0c47de7e6ac