Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4e76d1cfb31a72…

MALICIOUS

PDF

120.0 KB Created: 2021-03-18 09:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7ab2a0958096ba817e429f1a25470931 SHA-1: 0ae613f6cc6e32a794b30d3cd0da15194aaca515 SHA-256: da4e76d1cfb31a7205347ee214380ac073a5956a9d22ce3ff4b8fbd1195949a2
134 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document as a link farm on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=kitchenaid+pro+600+design+manual PDF link annotation
    • http://serawuv.mygamesonline.org/45013979647.pdfIn PDF document text
    • http://opsnatur.fun/fafevun5vvs.pdfIn PDF document text
    • http://stankoff.org/taresukedekukaxere4s8n1.pdfIn PDF document text
    • http://brumbum3.xyz/klondike_solitaire_ruleskui8k.pdfIn PDF document text
    • http://hurleyshamburgers.com/dudivalibijesc2iwh.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/technical_analysis_books_in_hindi.pdfIn PDF document text
    • http://kufomabid.mywebcommunity.org/mastering_bitcoin_unlocking_digital_cryptocurrencies_free.pdfIn PDF document text
    • http://creamwalls.space/asymmetric_information_in_health_caregexse.pdfIn PDF document text
    • http://twirlini.com/tuxogakebejubogirt3jah.pdfIn PDF document text
    • http://noverst.xyz/sdgs_17_goals78n5o.pdfIn PDF document text
    • http://edarudost.online/my_talking_cat_koko_mod_apk_android_1ielm5.pdfIn PDF document text
    • http://dobofozepop.mygamesonline.org/elementary_linear_algebra_a_matrix_approach_student_solution_manual.pdfIn PDF document text
    • http://tegor.xyz/muvozakinizoduw14m4.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/timex_1440_sports_watch_turn_off_alarm.pdfIn PDF document text
    • http://qiwi-wallet.online/the_color_of_magic_full_moviejuo8x.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/wezut0pyt3.pdfIn PDF document text
    • http://majikok.mygamesonline.org/15526022982.pdfIn PDF document text
    • http://money-team.site/ace_care_plan6p1s5.pdfIn PDF document text
    • http://lukufogud.getenjoyment.net/calidad_definicion_segun_autores.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/tudolirovopudogora.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://jojulupijawide.onlinewebshop.net/285848238.pdfIn PDF document text
    • http://pujumek.myartsonline.com/effectual_definition_used_in_a_sentence.pdfIn PDF document text
    • http://bugazepoja.onlinewebshop.net/gigifipofonexurufozube.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001825e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1825E 5752 bytes
SHA-256: c5758721fb2a2c418a591dd1fccc0900d8c86fefa1c314d84de2ecbe1a52bac2
font_01_sfnt_off000195bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195BB 6512 bytes
SHA-256: 1c228200e34475a88ba52207e55ab2e2421dd892e422ce9f9ce31ec9603fe87d
font_02_sfnt_off0001a710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A710 12944 bytes
SHA-256: 626a1e7470185b0b47d52a4e6f9bf66ec81f7d8f50994e10fe9b64e275d458b1