Malicious PDF — malware analysis report

Static analysis result for SHA-256 898ea602cae3aa58…

MALICIOUS

PDF

88.9 KB Created: 2021-05-17 02:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 96c5a91dbc79bbde6adc4dcd6cbda1c6 SHA-1: d8b003de58729f5691ab7f60f627d45488f5f567 SHA-256: 898ea602cae3aa58afa5f40a5b33c666cad115b88361d4ab3bf2d8d5a94b864a
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 0.9997

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://vilenefex.ru/strik?utm_term=fiasco+rpg+bgg PDF link annotation
    • http://robugipunebib.mygamesonline.org/how_to_start_subaru_ea190v_pressure_washer.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/nuo4gcR/glow_art_drawing_pad.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/5hbjjgj/goledinuxed.pdfIn PDF document text
    • http://migipobazu.mypressonline.com/causes_and_effects_of_the_liberian_civil_war.pdfIn PDF document text
    • http://vawadofofasip.getenjoyment.net/electrical_power_cable_selection_chart.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/0fe5e900-c1a4-4534-8bf2-b79945257a76/how_to_hack_a_furby.pdfIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_24e6192c47eb4c3fa0c0a53e227d75d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/thanksgiving_phonics_worksheets_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a8d9961-465e-4ba2-961c-b2fd2ba2febf/hamilton_beach_roaster_oven_turkey_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/089cc4e0-3ecb-4dbd-a136-f9a6274d7946/who_is_the_killer_in_texas_killing_fields.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/wopemim.pdfIn PDF document text
    • http://napamewa.atwebpages.com/wimoxenigezixutox.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/nys_income_guidelines_for_wic.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/firefox_47._1.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_12071112c0714795aec1aae33e3110ca.pdf?index=trueIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_7f4933f27f8f4d1796c2f5f28a3dd5ef.pdf?index=trueIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_9194ec0d66824fc0a59dfa41ab5e498c.pdf?index=trueIn PDF document text
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_fdbeede3863c46029241521647cc1296.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/kuwadaxaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d510810-069a-4a8f-ac22-03a3f70fa4b1/what_is_the_theory_of_falsifiability.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17faf9cf-fdbb-41de-b425-416a562a52c1/how_to_use_crock_pot_express_crock_xl.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_off00011eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB6 5164 bytes
SHA-256: 75eb47a9e073f890e5167e08eac62df91c16d623c0a6755ab41e1c5adcebf637
font_01_sfnt_off00013053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13053 11264 bytes
SHA-256: 6eb018ad59d09f2c67ae5be5a604d797e0392eb5be21c9f8989d8042a66695dd