Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83a8a074a8eafde…

MALICIOUS

PDF

74.1 KB Created: 2021-03-23 12:16:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 615f3016d2232c7afa533927e594d37e SHA-1: 97c6cfe83c91168f993768a70387a0f0fa38e171 SHA-256: f83a8a074a8eafdea4067bd0d61a005bbeb31c97c7759fe7d3b30be3bc836ca5
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 are SEO-themed, suggesting a link farm or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs indicate a likely attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/123?utm_term=linked+list+implementation+in+java+pdf PDF link annotation
    • https://cdn.sqhk.co/petawelesup/jQztibr/miranda_lambert_new_husband_age_difference.pdfIn PDF document text
    • http://draiwenstore.online/stunt_car_racing_multiplayer_onlineo2k9v.pdfIn PDF document text
    • https://cdn.sqhk.co/vekudaselux/iiiiidf/free_live_wallpaper_download_iphone.pdfIn PDF document text
    • http://uscovidcharts.com/how_to_watch_big_little_lies_australia6iqmf.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/dibPjHn/best_board_games_for_adults_3_players.pdfIn PDF document text
    • http://true-board1.club/guberalajuvolexixogawm6ct9.pdfIn PDF document text
    • https://cdn.sqhk.co/jomenuluz/ti3tPjg/27728470625.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_f559b6c0f9224deb89b510f35f0613fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/29018738089.pdfIn PDF document text
    • http://tutanimonuwodam.epizy.com/big_bus_miami_map.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/vetilokokikiwigo.pdfIn PDF document text
    • http://bopevevene.epizy.com/payroll_management_system_synopsis.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/tax_form_for_sale_of_farm_land.pdfIn PDF document text
    • http://fewebife.rf.gd/bruce_lee_striking_thoughts_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/74495221992.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/arabic_calligraphy_fonts_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/resume_and_cover_letter_templates_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/memakuxitagabulotufi.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_cf2425f544f84ba99cedb101254f2166.pdf?index=trueIn PDF document text
    • https://c44f4a6d-8922-4093-a150-c9e6b6244fdd.filesusr.com/ugd/b371d9_242db6ea24754b3b8b8d1d2c0473fa4c.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_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 5232 bytes
SHA-256: 0b4375ca236ca3a7ee2ac8d062d625bf5cde8a691b4d9813223aa5a7e021d98e
font_01_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 10860 bytes
SHA-256: 4765759d100a7250df10260db09738fe5e96475a1dc39f08394e5e6c700bf73f

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