Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76b1ee4eb825dd1…

MALICIOUS

PDF

71.1 KB Created: 2021-04-01 04:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 52bcd2fb3c5f12adc8093d8332941eca SHA-1: 7e7bb219be4ed533eff5285e873ab1ed57669ddd SHA-256: e76b1ee4eb825dd1c56fd6ec5bab1461c2d577ae724daf9e76bcc0f604a77e90
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically pointing to a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier strongly indicated maliciousness, and the document body, though partially corrupted, references an 'appeal form' and contains metadata from wkhtmltopdf, indicating it was likely generated for a specific purpose. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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/123?utm_term=aetna+better+health+provider+appeal+form PDF link annotation
    • http://sixesijilolun.mywebcommunity.org/checklist_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/e6QNigC/xotejedesubejutomalefunop.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/bieTz6g/lucky_duck_shoot_game.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumila/UgiR8Lc/dragon_age_inquisition_mage_build_guide.pdfIn PDF document text
    • http://wupidubame.mywebcommunity.org/fibulafolariwifebalurejiw.pdfIn PDF document text
    • http://vufilulojusabid.iblogger.org/79895250627.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/aquila_rift_short_story.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/doniwoxojuziv.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/NOhcifW/car_parts_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/jieif3v/adidas_x_star_wars_2020.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/7bc3540d-3c71-4202-933f-1587ee9b895a/51214021397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fdd25e2-d6cf-49af-b2bf-93c65a91d8c9/waravubimixigapaxusaxejug.pdfIn PDF document text
    • http://tazolupiviroliz.epizy.com/3648813945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba56a8b-0591-4560-ac30-3f45951a43b1/one_of_us_is_lying_sequel_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a32374f-9af1-499e-8a68-2ff7f1e50fa3/the_mousetrap_movie_agatha_christie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3cae524-3969-43b9-b720-fae85c86b536/the_submissive_activity_book.pdfIn PDF document text
    • http://zewadomi.myartsonline.com/magazine_telegram_channel.pdfIn PDF document text
    • http://kojevas.epizy.com/rafixojugatil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c109e5-7978-436d-96d6-fd43b52418db/ruvuzozej.pdfIn PDF document text
    • http://kasupetaderimit.rf.gd/74917596852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a40a5f39-26a0-4345-bc1d-dee3b9b53ac4/how_to_bypass_washer_lid_switch_maytag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd3e2ef-c15e-44ee-beb3-558bef84dec1/samsung_remote_control_bn59_replacement.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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 5292 bytes
SHA-256: fe817129160534904a64b3956b5a43dea0b69690f63a9c34f6688d493ac31887
font_01_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 10536 bytes
SHA-256: a49cf784efbe7a6f612d200df8c72578739b7192df3f3907a8136c8d5deca50b

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