Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16efed9fb0d7dd1…

MALICIOUS

PDF

90.6 KB Created: 2021-03-10 00:29:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 9c984e3380db212a53aaba867cde2e19 SHA-1: 956db748a790f67ba13bd3302f41b94cecd6dc0b SHA-256: a16efed9fb0d7dd177c79203ccd2aa7e43373afa6c0ac8e0b8b2e4961bb40a8c
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, identified as a link farm on disposable hosting. ML classifiers and ClamAV also flagged this PDF as malicious, with a high probability of it being a phishing or trojan distribution attempt. The presence of embedded URLs suggests an intent to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/award?keyword=contrapunto+musical+pdf PDF link annotation
    • http://mazers.fun/gigunopugar8alm.pdfIn PDF document text
    • http://jushq.club/9405511728477h1s.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/15167625943.pdfIn PDF document text
    • http://msertis.xyz/vovesejuzogulopowowujao5hxr.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/descargar_discografia_los_tucanes_de_tijuana.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/92106032088.pdfIn PDF document text
    • http://tronreserve.online/simple_harmonic_motion_and_waves_worksheet_answers8mthf.pdfIn PDF document text
    • http://madewithsunshine.com/80523153452t1spq.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/basketball_shooting_drills_for_high_school.pdfIn PDF document text
    • http://xokapik.mywebcommunity.org/is_equilibrium_dynamic.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/mabariwoduwalevekisudewuz.pdfIn PDF document text
    • http://jepaxikunaku.iblogger.org/bernoulli_ordinary_differential_equation.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/how_do_you_get_agile_certified.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pusolegulijased.rf.gd/zogibifefododirosubab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4cb98e9-9eeb-4e48-a787-f56056335eeb/epson_xp_410_how_to_print_black_only.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/tokedolafawakobafemus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdb0486-1def-4c1f-a2c9-c41f649370ad/figomoteteju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1707618-1e5a-445a-9477-4b84b7dbb251/how_to_obtain_pals_certification.pdfIn PDF document text
    • http://talagolow.rf.gd/93892367413.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/informacion_sobre_el_chamame_argentino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b03f4f-0836-4da8-99d5-3e3dbb48e58c/scid_5_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39397a1f-e91c-4631-a9eb-5ca3c460a875/78958179990.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/tatodezuguz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 5088 bytes
SHA-256: eadea931c166c673841600f82c3ff7e6ae29f8303201972b619e87302bc55c0b
font_01_sfnt_off00012baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAA 10376 bytes
SHA-256: 303fc577877551c186189f290b4b1dbc5c6bc2ec3831f2ca9b0255691fc4e0dc
font_02_sfnt_off00014ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ECE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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