Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb9ff68734a1a4b…

MALICIOUS

PDF

78.4 KB Created: 2021-03-11 23:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0d61bce4e422b2188820bb16ef2a0a59 SHA-1: 6d0529b715faee798e12e420de7a9d509df3b844 SHA-256: 6bb9ff68734a1a4be3a4f2e0348f2763316692d0c586550d92fc45a029fcdb54
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 or trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identifies it as a link farm. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dugedepap.ru/wix?keyword=dog+from+nightmare+before+christmas+name PDF link annotation
    • http://mozejewij.iblogger.org/evaluative_reading_comprehension_test_online_free.pdfIn PDF document text
    • http://vobuxunulorepi.22web.org/29720329580.pdfIn PDF document text
    • http://nebo-baikala.ru/menofiwidizevuboxeparasodsx192.pdfIn PDF document text
    • http://winnerslm.space/wireless_n_wifi_repeater_factory_reset1rjen.pdfIn PDF document text
    • http://rent-nout.site/que_significa_soar_con_cucarachas_muertas_en_la_comidaxh7hh.pdfIn PDF document text
    • http://winoorama.fun/12600434317jy3yb.pdfIn PDF document text
    • http://pss77.ru/nextbook_laptop_battery_replacementls4q9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wosaxadef.rf.gd/6735695141.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/32497391516.pdfIn PDF document text
    • http://weketabafizevu.epizy.com/lagu_aetherian_the_rain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e28cbd-20a0-47d9-bad4-a03809dec2dd/libro_la_metamorfosis.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/the_prince_2019_full_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca033cfb-ba61-443a-886b-2b2ae7dd5860/vevojagu.pdfIn PDF document text
    • http://buzatagijekoj.rf.gd/80631653174.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_d24e296227c54111a307bb411b89423e.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_6fe62eeec8ed4b528aa0f21437d708c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/606d4691-3132-406f-95dc-24ecfac87e6e/19476967281.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_1baec83eef0d4567ae3738bf3bd69cb3.pdf?index=trueIn PDF document text
    • http://ketabigumowun.atwebpages.com/ignatius_study_bible_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b207f9bf-f070-4a22-970e-a3a1c99083eb/is_king_james_the_most_accurate_bible.pdfIn PDF document text
    • http://kalasoziluxolim.myartsonline.com/58839767167.pdfIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_76222fe8ba574ce4a96bc913cab90725.pdf?index=trueIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/lawn_boy_10685_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/baziwasalu.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_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 5400 bytes
SHA-256: df9c8bf81e99df268ea897b84b91c66bde8ad6eb20abfccfe72525560f666160
font_01_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 10516 bytes
SHA-256: 2a0b9f85ecf7656983db493d19b558aeb62522c21d1a66f056ccb240dd3d900f