Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e4f611e90f9281…

MALICIOUS

PDF

73.1 KB Created: 2021-03-20 14:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 02e27e37cfb7632ed777599a675d4c19 SHA-1: 45eb5c195fe71048edfdf8a3adf4de99b0522f83 SHA-256: 24e4f611e90f9281051569c4b19035fb5d693d02e19a84e3a40cbe978b23215d
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to downloading a GMAT guide, indicating a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://gimoguvi.ru/wix?keyword=gmat+official+guide+2017+pdf+download PDF link annotation
    • http://sotarebesowula.medianewsonline.com/b_pharmacy_syllabus_2nd_year.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/hiMhb8G/bengali_movie_bandhan_mp4_video_song.pdfIn PDF document text
    • http://gikedipe.22web.org/cbse_class_6_syllabus_2020_18.pdfIn PDF document text
    • http://ziwavabewite.66ghz.com/kezelasufujis.pdfIn PDF document text
    • http://doxedisipi.scienceontheweb.net/seth_klarman_letter_2020.pdfIn PDF document text
    • http://wavakidagipav.iblogger.org/bakemob.pdfIn PDF document text
    • http://7lessons.site/75168342391i8nl.pdfIn PDF document text
    • https://cdn.sqhk.co/jizesusaxeta/MgGjgjb/66868107622.pdfIn PDF document text
    • http://goshop32.site/lezavujamirunugolupogajunwfy7.pdfIn PDF document text
    • http://grizhoff.ru/In PDF document text
    • http://yandex-delivery.cc/pathfinder_gamemastery_guideqcqrz.pdfIn PDF document text
    • http://getcabinets.xyz/ez_drummer_2_full_download_macg1h3o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_61a203fb81ca4663b16361177311571a.pdf?index=trueIn PDF document text
    • http://butorinowu.myartsonline.com/russell_index_calculator.pdfIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_8d1bc3fa2fb04db3a5367c51ec7c6c2a.pdf?index=trueIn PDF document text
    • http://nufolupi.epizy.com/xibamivomixerimagal.pdfIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_e7162151c6ea43a8b50bc17a8729c253.pdf?index=trueIn PDF document text
    • http://pemixatu.epizy.com/flow_chart_creator_free_online_no_sign_up.pdfIn PDF document text
    • http://fijukarevi.epizy.com/70442121614.pdfIn PDF document text
    • http://rejaramexalib.epizy.com/number_theory_and_geometry_an_introduction_to_arithmetic_geometry.pdfIn PDF document text
    • http://legokejapo.atwebpages.com/tilene.pdfIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_4981bae9dae1446aa39f47dbafa97eca.pdf?index=trueIn PDF document text
    • http://nelaxufap.rf.gd/62182780590.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_off0000dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 5728 bytes
SHA-256: e321793e61bb29a055c11932be5777189ff3687693709ae1fcd19f57fae40b3c
font_01_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 11068 bytes
SHA-256: cc4ef0b02fc0ae243ce49d055ff15b997e275684130c68247e795f95d86f0229

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