Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6b788d987fdd00…

MALICIOUS

PDF

104.6 KB Created: 2021-03-10 14:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e847050b6da9ea478005153865738990 SHA-1: a7bf0f13e0145815bd58c129c002d29018e1e6d9 SHA-256: 1f6b788d987fdd0038d2abf03f7b922929427621a692db279dad5700dee57647
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable or dynamically generated domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://mezovuduw.ru/award?keyword=complete+hatha+yoga+asanas+pdf PDF link annotation
    • http://figimumagoko.mygamesonline.org/pablo_neruda_book_of_questions_poems.pdfIn PDF document text
    • http://vofufime.mypressonline.com/17219847110.pdfIn PDF document text
    • http://gasomenuza.iblogger.org/adobe_photoshop_fix_app.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/safety_first_ear_thermometer_probe_covers.pdfIn PDF document text
    • http://xalelokepevidon.iblogger.org/the_heiress_chinese_drama_eng_sub_ep_11.pdfIn PDF document text
    • http://nasumowuvajoda.iblogger.org/pajoburifusilagiza.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/3c151d3f-98ea-47bd-9d5a-179401341342/someone_like_you_chords_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/cable_one_tv_guide_nampa_id.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/250e9650-e9a2-4e2b-98b6-be0c184f2082/misotelivuxinowamexedid.pdfIn PDF document text
    • http://jepisaf.epizy.com/bitoxep.pdfIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_3f6adc922170428bbe4a5b8f8f827978.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votawawo/vuwefanamuboseleduxefuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/vajejiwesawatula.pdfIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_1bbb9a41657a494eaa83bee7bf5ebe76.pdf?index=trueIn PDF document text
    • http://wewamamewiler.atwebpages.com/xipeniwatatupufen.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_08976721ca514fc394a3a5b4e44e5320.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/cdc_congenital_syphilis_report_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ac085a-dd83-485e-94de-9a28a4d7d95a/ariens_5520_snowblower_for_sale.pdfIn PDF document text
    • http://retiziwo.myartsonline.com/tudelajotojom.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/cheats_para_pokemon_glazed_gba_espaol_android.pdfIn PDF document text
    • http://veluvuwipigunuw.rf.gd/62746490832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/446f8adc-37d6-4c1f-b5af-63f958f62bba/tepobajenedolari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8dbf953-cc6f-4db6-baf7-14742d42dc03/what_are_the_general_principles_of_law_of_contract.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61658d00-4b75-4474-93ea-31a36a831360/59430554113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35fad0e-6543-4af6-8224-4383cae23312/plantronics_cs510_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e812bba-9c41-4177-8eb1-77b3d0e88690/gukisixoburosesumovalu.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
stream_004_off0001706e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1706E 11448 bytes
SHA-256: 79b5ed9af1c57dab78342facf226dce933b640a40744d69edc9a533d1616adf4
font_00_sfnt_off000128cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CB 5364 bytes
SHA-256: 5e98d98a3e7f2f109516ac2bbaf245a88202cb3ecf7716faa22c0e21ee9eeea8
font_01_sfnt_off00013aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEF 18440 bytes
SHA-256: ec85d7c5d38c2ee7a267116cc34849b34a09b9be62db569588b51fe9ae1a5e63