Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c48b228a0a956db…

MALICIOUS

PDF

78.0 KB Created: 2021-03-17 19:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9da15ac3122c58aef59bc3426fc2c02a SHA-1: d2e9e0ec7c97a77e1cbb09a63a98159395097baa SHA-256: 0c48b228a0a956db54e2f2a25db5d3989dcc3337ce04f7fc3aba6c9736d1c750
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a search query, reinforcing the lure of a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=sony+xplod+52wx4+bluetooth+verbinden PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387815/normal_5ff209ba50bcb.pdfIn PDF document text
    • http://mobutadaxez.medianewsonline.com/gazizenotuwabaw.pdfIn PDF document text
    • http://letogala.iblogger.org/lokevevanidapenexuz.pdfIn PDF document text
    • http://wogamilip.iblogger.org/vavap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_6010461e91db3.pdfIn PDF document text
    • https://cdn.sqhk.co/pododefakes/eTbgahh/bible_offline_apk_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/doxufojixene/Yghichj/8936488076.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/Mgiierl/usborne_my_first_word_book_about_food.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472768/normal_5fc95c44536b3.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/cXgggjS/71771639273.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450889/normal_6007236207aa8.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/QWibihd/stackers_jewelry_box.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450624/normal_603b116caaf69.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/BifhgS5/alabama_football_national_championship_trophy.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/fiaojfR/never_ending_dungeon_idle_rpg_mod_apk.pdfIn PDF document text
    • http://zosujobitusup.iblogger.org/pakotatemekaxaxux.pdfIn PDF document text
    • http://mofonuf.medianewsonline.com/75878416510.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikizefomuwajo.rf.gd/what_is_the_quran_composed_of.pdfIn PDF document text
    • http://sexililelaweru.rf.gd/linear_systems_and_signals_2nd_edition_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/72787081510.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/96321594184.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/how_do_i_use_my_bosch_silence_plus_50_dba.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 5568 bytes
SHA-256: 4d37f2f28c2b6dc5562ea89a7336f59196b53d2fac28e572d858ead96a2a83c5
font_01_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 11888 bytes
SHA-256: 3bd5573071ead260a31474220516b7d3cfac00b0367ae41886b3009e12b857db

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