Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c3c773114f82bc…

MALICIOUS

PDF

70.9 KB Created: 2021-06-02 21:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fd64c0e74c1617d4f570e98f5af4393b SHA-1: b5388a307f9bea2090b67cbbb1075f9ba212f541 SHA-256: 73c3c773114f82bc99663ac79dd9a4ed04b7a259148ba04c813226da2dd6dec7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to potentially unwanted software or phishing sites. The presence of a link with 'mcpe 14.0.1 beta download' in the UTM parameters indicates a lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://archism.ru/pbw?utm_term=mcpe+14.0.1+beta+download PDF link annotation
    • https://tuvomirunasoz.weebly.com/uploads/1/3/4/3/134324776/xuwaf_vopavuk.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/c3912fc.pdfIn PDF document text
    • https://kitigenuripoduj.weebly.com/uploads/1/3/1/0/131070171/7104471.pdfIn PDF document text
    • https://kamejufozafa.weebly.com/uploads/1/3/4/8/134891268/zuderodimiku-larezi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_5fdfcc30e6eba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493597/normal_5fde82a814238.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff38219-1851-45c9-8f52-a0b2e3f4ed23/xewivetevukub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eab4126-b518-4c28-8d3b-244aacbb8c58/john_deere_sabre_14.5_38_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf07057-ec14-42ab-b864-2870f1c18d59/10995590777.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/f/how_to_use_laplink_pcmover_pro.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144412455/zurudexuvekivojodimone.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/f/how_far_do_you_plant_okra_apart.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144422487/virus_and_bacteria_coloring_worksheet.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144457833/manual_de_taller_ford_ecosport_2005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2cdff5-e46d-486b-b6bd-d1492bd834b8/49209476230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be9579e-09c8-4243-acab-44f99eb70c53/tp-link_tl-wr702n_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/683e2a7e-1828-4910-8f86-fb0c5732af91/instep_bike_trailer_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3d55ac-dc4d-4a25-bdf7-2239990ea3bb/troy_bilt_pony_serial_number_location.pdfIn PDF document text
    • http://joxupakager.pbworks.com/w/file/fetch/144488718/how_to_read_sheet_music_for_keyboard_beginners.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/89028019831.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/wajifebidifogevipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a537afac-aa2b-493f-ace3-321dfa91e081/kogomosuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73ffdf0-e26f-46b5-af41-9656b4f2e652/beneficios_de_la_leche_materna_para_el_bebe_y_la_madre.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_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 5344 bytes
SHA-256: 430ac5b8a1f58873263a59ba9a3f0c4c2f8f7fad4c195324d5ecb0ce930c7cf8
font_01_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 10492 bytes
SHA-256: c274f5f4ca980a3d1ec0cbc8bdbbb6e79e608b0ac94d0dff14a0f027eecd5105