Malicious PDF — malware analysis report

Static analysis result for SHA-256 7780bc74fa0af8c9…

MALICIOUS

PDF

79.6 KB Created: 2021-06-13 03:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4b403a804430d8615353020228d8aa73 SHA-1: c933cf7f10ccf9df5076d5aa1fe258cd78ed3776 SHA-256: 7780bc74fa0af8c9dd259ab5db2fe2bc2bfe16fc13e6f4f752617fd64eef6c4b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, which is characteristic of SEO link farms. The embedded content, though heavily obfuscated, appears to be a lure related to a search query. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/pbw?utm_term=what+is+the+chemical+formula+of+vegetable+oil PDF link annotation
    • https://xatotaga.weebly.com/uploads/1/3/4/7/134726025/ab06cf8394890.pdfIn PDF document text
    • https://sarisiwubaj.weebly.com/uploads/1/3/0/7/130739508/821658.pdfIn PDF document text
    • https://dovabobu.weebly.com/uploads/1/3/5/9/135978637/puwedepif.pdfIn PDF document text
    • https://zedebofewel.weebly.com/uploads/1/3/4/5/134594015/4342697.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vomokig.pbworks.com/w/file/fetch/145101549/benegag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc6b6a5-cb5a-4c94-9295-db1ecedec71b/54476640786.pdfIn PDF document text
    • http://zobafolu.pbworks.com/w/file/fetch/144987393/sezabavitibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c02a7a11-c9cb-419c-af57-63e7708503d3/6300364459.pdfIn PDF document text
    • http://lajaweridadi.pbworks.com/f/75743178191.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/zong_free_internet_code_2020.pdfIn PDF document text
    • http://lebinowurut.pbworks.com/f/happy_birthday_song_status_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d693e5-898b-4e70-9ff0-979794f51098/posolurinudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d58637-6a8f-44b4-abf1-d0d869e80c48/18281381657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078c81f7-1fac-4c82-8f5c-ec24fdaa07a2/how_to_use_prestige_oven_thermometer_in_the_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430ced04-522f-404e-8dcf-b2cb790774d7/seabrook_island_lake_house.pdfIn PDF document text
    • http://veweran.pbworks.com/f/roxenumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f90e684c-c1d9-4947-80d0-5c769bb72e53/83109184008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a67aea-11f1-4eb9-b952-b5a4b42a7e0c/basic_engineering_circuit_analysis_10th_edition_solutions_download.pdfIn PDF document text
    • http://tujedet.pbworks.com/w/file/fetch/145006314/venn_perplexors_answer_key.pdfIn PDF document text
    • http://vesusezipuwe.pbworks.com/f/som_by_rk_rajput.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59962a82-f7f4-404c-858d-e3875a6ff2b0/90486641120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/885651c8-10ab-4740-ae26-45a1df418638/jupimudezij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f721591d-5ab7-4485-ab8f-a9ad8d1228fb/like_mike_pelicula_completa_en_espaol_latino_repelis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001d0281-6409-4009-8eeb-5e19ac985461/mtd_lawn_mower_parts_manual.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/f/gotorazesisizewiviradefet.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_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 5508 bytes
SHA-256: 55ef01730df2d1f63aa2702cae4fe0251ce7c1ecd5fb45a828242b19e54353aa
font_01_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 11260 bytes
SHA-256: 9afb07c5cee1237767e2bc82a532e3f473c01a1546cd8297f3a60ed0e343600b

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