Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9df97c76cda8c6…

MALICIOUS

PDF

91.9 KB Created: 2021-06-05 16:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 37d3c59724e9218f6e7a319069d6c676 SHA-1: 1361207656e0bc8cd16ba1a49061f7b215ca1727 SHA-256: 8b9df97c76cda8c648c3e80b25b8dd2d96b6cb5c5a417f94219d460fef14ea00
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content or phish for information. The primary URL identified is https://nomylo.ru/pbw, which is likely the intended destination for the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://nomylo.ru/pbw?utm_term=examen+primer+bimestre+primer+grado+lainitas PDF link annotation
    • https://bogexisamalalu.weebly.com/uploads/1/3/5/3/135320210/a0b3a8e0bf8c.pdfIn PDF document text
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/kemudedegovawat-rapamezexiduza.pdfIn PDF document text
    • https://worowisirokisid.weebly.com/uploads/1/3/4/8/134856274/6867606.pdfIn PDF document text
    • https://nodopemewave.weebly.com/uploads/1/3/2/6/132682748/nawaxininuxufaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fevawigo.pbworks.com/f/plantronics_bluetooth_headset_pair_with_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49cd6f44-2795-4ac9-8b3b-06cea331d042/giwuki.pdfIn PDF document text
    • http://xixokuzujoz.pbworks.com/w/file/fetch/144568275/64833708482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e8d683-f9da-4d03-a849-ccb462f2cd44/58003476324.pdfIn PDF document text
    • http://risoxef.pbworks.com/f/is_gluten_free_on_keto_diet.pdfIn PDF document text
    • http://tasonupopam.pbworks.com/w/file/fetch/144596136/how_to_help_round_ligament_pain_in_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4f96e3-3936-4b4f-a762-32c2dccb1251/how_to_make_a_custom_kydex_knife_sheath.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44641a78-d44a-4939-ae43-689395edc0d8/mass_rmv_rules.pdfIn PDF document text
    • http://veweran.pbworks.com/f/colours_kannada_serial_song_download.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144507768/pigizubiduna.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/where_can_i_read_the_untamed_manga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e26942b-c67d-4dc8-8bda-0f28e4960f76/short_moral_stories_for_kids_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54540835-270a-4a96-a68f-60a55bb0afdd/is_kempton_market_open_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0177c3cd-8166-456f-b398-8d20351f9463/masegefolapurizalubikoxe.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/6667158432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adcb5ee4-c44b-4cef-96cf-bd98d9ddfc05/nazavitumijopape.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/w/file/fetch/144510651/regresion_lineal_estadistica_ejercicios_resueltos.pdfIn PDF document text
    • http://fudejob.pbworks.com/w/file/fetch/144576729/54443175789.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/how_do_you_know_if_a_liquid_is_polar_or_nonpolar.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_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 5444 bytes
SHA-256: 72d336db362159d7fbf99839874d0372358f30f596040fe81af312e6c5eca492
font_01_sfnt_off000137de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DE 12744 bytes
SHA-256: 52e2c96160d238786e24b5833e7debfea97c2e7473ec76776b9898e07d47d689