Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a6cac2e9f1fb79…

MALICIOUS

PDF

72.2 KB Created: 2021-03-15 00:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 260988894874c2ffc0416faf8cc5063d SHA-1: 9e130644c672125f09d47741501e6f3dab95b093 SHA-256: 89a6cac2e9f1fb79b36d6d57f709450f3d4539a459d119e7597a128279a6be44
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=engineering+an+empire+byzantine+worksheet+answers PDF link annotation
    • http://bopolubolef.mywebcommunity.org/24901858210.pdfIn PDF document text
    • http://xonigej.mypressonline.com/ethernet_drivers_for_dell_inspiron_570_desktop.pdfIn PDF document text
    • https://cdn.sqhk.co/tijonodevi/CiijdZe/tukijemevorixamafenewive.pdfIn PDF document text
    • https://vivagijep.weebly.com/uploads/1/3/1/3/131383698/7926591.pdfIn PDF document text
    • http://kafalukuwemi.mygamesonline.org/xamatetox.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/zotelasawavovudov.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/jeidghe/52665552117.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/28864f49-c782-4337-8256-94b5946a31af/electrolux_perfect_steam_dryer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6346ea9f-b171-4348-995d-983532b53ba3/amc_10_12_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e945ee8-9aa9-4949-9109-d0ae1ab065d8/ms_word_shortcut_keys_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6de385c0-7c81-4a94-8565-e38fe611fa44/hillsborough_county_schools_report_cards_quarter_4_2020.pdfIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_71995ac336814e9588feca2225dd1b30.pdf?index=trueIn PDF document text
    • http://jetotajasavesi.atwebpages.com/video_games_lana_del_rey_sheet_music.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/indrajal_comics_phantom_bengali.pdfIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_5e258650b30b4168888d7e45768cfdd0.pdf?index=trueIn PDF document text
    • https://b595a6f9-6bcb-48d8-acfc-7cb8c696cf55.filesusr.com/ugd/21f311_24cc4cc01b1e4ce7b7769e673b0be0c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2746db01-2a47-469a-beec-589b79b8db79/65438337728.pdfIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_b7c6f313d07741ca87a5b66023cdac04.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27C 5396 bytes
SHA-256: f72f1191695ea1384cbb747e2ec1a322ddc2b2b084039326605420edfbe2142c
font_01_sfnt_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 9572 bytes
SHA-256: 70108b095b8034e7dec0bb5a1d8d902fec02d9543b9e9f3974986d2870db195d
font_02_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2