Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3dc5f27e053b956…

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 10:34:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 50ee39d0448f01c3490b1ae5420100cd SHA-1: c8d8153433b3a72ca6aee49863c445d0601773ce SHA-256: f3dc5f27e053b9561e58f5900fc54d6c458fc9c9d0c7b90b618ceab8b3c279d9
136 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many of which appear to be part of an SEO link farm designed to redirect users to other sites. The primary redirector URL is identified as a potential lure for free downloads, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/strik?utm_term=t+trimpe+2000+http+sciencespot+net+length+lab PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474719/normal_6009ff4fb525c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_6043b1c0cb562.pdfIn PDF document text
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/4150923.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/UYiSnib/wosuzozifesefatapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421365/normal_603fc8d43f960.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/hRhjgjR/huey_magoos_apopka_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/hihgf6i/bike_race_cool_math.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/QRugjja/fukuku.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/uC0w8gf/78990049679.pdfIn PDF document text
    • https://zigikarorusoto.weebly.com/uploads/1/3/5/3/135351373/fukad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_60560bede0dbf.pdfIn PDF document text
    • https://cdn.sqhk.co/gafokoru/jdhdgeI/n64_emulator_games_pokemon.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/ukX3jjN/ludo_king_online_play_in_jio_phone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421934/normal_604f2d3a1bb0e.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/ea5e2a7d-60b0-4922-a49c-24486a8de74a/hp_laserjet_1100_driver_windows_7_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b6b0920-fd70-434d-9587-81521a4b92bd/video_games_to_play_with_friends_on_different_computers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8831c3e-7eab-45c9-9b70-b5af398f2841/what_is_screening_in_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d351b7d2-048a-4a83-b53e-b026dcc4fd12/management_information_systems_mis_mcq.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1089b637-078a-44a8-8c68-eb0459763bc3/12948414605.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_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 5712 bytes
SHA-256: 25b694153794800397195936fdd23831ebeeac3d58f4e8bf1bd3b0b297587ec8
font_01_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 11420 bytes
SHA-256: e183cf26c6d4a25a7a059b074aba5c83d81dfdfac7bd8736f3dbc2d456b5544b