Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1191271e00525cf…

MALICIOUS

PDF

76.4 KB Created: 2021-05-12 07:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2242535bb1b1ca746e22bc16c28e8d81 SHA-1: 10b5c01d796c35965a9ca2fa5aa95dad03617f5b SHA-256: d1191271e00525cf82e6b3aa8d6fe65fdcbf6d2f60e65a96dd1d3235f9148056
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the presence of numerous external links points to a likely redirection to a malicious site, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://seumenha.ru/strik?utm_term=dirt+devil+hand+vac+instruction+manual PDF link annotation
    • https://cdn.sqhk.co/lupekute/cxhjix0/find_friends_iphone_app_online.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/Ujgihhh/jimusho_japanese_to_english_translation.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/ahjjfZq/classic_pianos_portland_concerts.pdfIn PDF document text
    • https://ferosikapomizud.weebly.com/uploads/1/3/4/5/134526037/804bf01d.pdfIn PDF document text
    • https://bowutemol.weebly.com/uploads/1/3/4/2/134234741/dumaxivupefese.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/gcPUEFF/top_ten_rap_songs_right_now.pdfIn PDF document text
    • https://rajotabew.weebly.com/uploads/1/3/4/3/134360909/60fcb767c7.pdfIn PDF document text
    • https://noverike.weebly.com/uploads/1/3/4/3/134349253/jikogibadizu-dedapino-lulosalifogolex-sogojipezel.pdfIn PDF document text
    • https://zokanebawabor.weebly.com/uploads/1/3/1/4/131438448/valekova_pegoluliporod_fupev_bozox.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/bfli0EE/guitar_hero_or_rock_band_xbox_one.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/jaNibje/stories_love_and_choices_obsession_chapter_15.pdfIn PDF document text
    • https://cdn.sqhk.co/vofepubot/agdjfCy/gupuzeteviwitogafojulojo.pdfIn PDF document text
    • https://cdn.sqhk.co/sikudile/fthdnyq/65773762589.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/iDmU0vW/feasibility_study_application.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/34f9b985-d980-4601-93dc-81633ffad96e/post_office_savings_account_balance_enquiry_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a54b5f-19f1-487e-90dd-81dc633a3b8d/dungeon_masters_screen_reincarnated_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9200f13-af48-47e2-a0bb-16e056e0f6ee/la_biblia_hablada_romanos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc2e8c80-fc6b-47de-9695-dc7839ab7bdc/warcraft_2_battle.net_edition_download_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c509de93-74e7-477f-b955-62bc4100c0da/introduction_to_computer_programming_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842cdbdc-5185-49d3-9761-267f1436e525/22967980212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf8a4ec-040e-4dec-a5c3-32132f21e745/lg_art_cool_mini_split_remote_control.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_45e08bad749d49529c1f1eea42291efc.pdf?index=trueIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_e4cfbd89217b48958d1fe101515484cc.pdf?index=trueIn 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_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 5236 bytes
SHA-256: b1ee4bfb8af8bccbbefceac37f4e973f0a77f41027485b2e306055bd436a2120
font_01_sfnt_off0000fb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 12020 bytes
SHA-256: f2c849d90909cd83fa73d057694de5b0eb5a4ee9442604163712a0909544f850