Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1435eaa4487fc54…

MALICIOUS

PDF

72.7 KB Created: 2021-04-08 01:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b01b77704eacc21a0fc0824c7b813a09 SHA-1: 59a4a04fe88dd9e779914284a3360da1a92a0b70 SHA-256: b1435eaa4487fc547376186fcd747cde04b6ce0b57d5d0d47959687898112a28
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xezojetit.ru/wix?keyword=wolf+m+series+double+oven+manual PDF link annotation
    • https://wabuxopimigom.weebly.com/uploads/1/3/4/0/134042903/da33197c76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459060/normal_5fec0663624c8.pdfIn PDF document text
    • https://buzotifosu.weebly.com/uploads/1/3/2/6/132695554/xarigemafexibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5fe7532992dc6.pdfIn PDF document text
    • https://tugesarafexo.weebly.com/uploads/1/3/5/3/135319839/matusodematob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_605a3fc4c9404.pdfIn PDF document text
    • http://moxupasasitote.mywebcommunity.org/l_appareil_respiratoire_anatomie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_6015a5ccdded7.pdfIn PDF document text
    • https://zuwizogagotajal.weebly.com/uploads/1/3/4/0/134012426/gisoz_paxega_wugizodeguval_jabeziroze.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/lebubeberejujivadunuwab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487927/normal_6029df04b6b1b.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/2207c020-4387-44b5-aa72-e882a6000ed7/topuzokixapusebaputew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8330193d-9644-446f-8daf-06400fce0449/32613445287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea77391d-fde9-4e0c-826b-1b93f2f31364/tu_eres_mi_mundo_translation_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996a965a-97e2-42a7-8d56-71908bdba4f6/the_little_mermaid_part_of_your_world_monologue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ba671e9-82f6-4df9-a226-1659c55e642b/lazelolugodivanugeruwaban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae971eed-ec2a-4fcb-868b-38f85dc76509/shark_navigator_lift_away_reviews_consumer_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a31507e-851a-4259-ac11-5c5af4bea514/how_to_pair_a_logitech_mouse_with_new_receiver.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/awei_bluetooth_headset_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/paguzazegitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91675b3f-4244-4201-b155-510fd4c68d7c/what_is_the_song_id_for_older.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17d6415-a4ff-435e-88d9-0bd80350ad02/83940667428.pdfIn PDF document text
    • http://sofibimibojas.myartsonline.com/geriwawutefidapasoka.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/what_are_the_requirements_to_join_the_coast_guard.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13D 5068 bytes
SHA-256: 40382f0e8de90d25d3cc754ca0ac068f0154f38e9c6627879313c08c65a9bfb2
font_01_sfnt_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 10640 bytes
SHA-256: 3d5eed1b132950b3e883bb10fa724e8cfb1c9a4a6d5c7e7f3e899b3bde76149f
font_02_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e