Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9c2fe749d82413…

MALICIOUS

PDF

77.8 KB Created: 2021-03-04 23:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d87ad50b048bf613a23cfb8aeb15144e SHA-1: b89c4a5f24fce057f6e60adcdb16f7849ba837f9 SHA-256: dd9c2fe749d82413889bdc09d960d1e72a4a11a58d3fff357f1b179047ee5c48
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL and the document body, which appears to be a corrupted attempt to display a title, support the conclusion that this PDF is designed to redirect users to potentially malicious websites.

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://nipisod.ru/wix?keyword=the+girl+he+never+noticed+read+online PDF link annotation
    • http://sreda.city/boules_rulesgzvmt.pdfIn PDF document text
    • http://simcars.ru/48050324144qg2yh.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/haldznX/gopivaderesar.pdfIn PDF document text
    • http://good-production18.site/amped_wireless_sr10000sluwb.pdfIn PDF document text
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/kudusetij.pdfIn PDF document text
    • https://joxegozul.weebly.com/uploads/1/3/1/0/131070165/5465a333.pdfIn PDF document text
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/fokofumit_bumimiraser_repepo.pdfIn PDF document text
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/f2f6e4f6cecd84.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/6Jghngf/mh4u_database_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/jajieje/78555660041.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/0cfad127-1aa0-43da-a554-1cf2f89cb94a/94852237737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c12154a-3cef-476d-991f-9d6a9fd9065d/briggs_and_stratton_vanguard_18hp_manual.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_55ff958a770c4370bf46579603327dab.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_9da793024e2749d8b2d74c1dfc42c941.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_e820b514703b46d7ae526e3961095fae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/capitalization_practice_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e9dadc-273e-4e63-8645-b639ad5b1aad/circuits_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/togamubegefizusikemij.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/pudumuvoralolutekep.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_d0ec1db6b74c4a65a41055f000aac92f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f48f4c7-27b7-44b8-9dd7-c74078263f77/xedegodapajuxoselareji.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_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 5032 bytes
SHA-256: 499ac253a4f0bc0bdbd4f9182e7bfa513e2f2c539649d3a4d3ed21eda8191775
font_01_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 10584 bytes
SHA-256: d0aa8f194d12762b571ab104137e4fdbac309756cc7bd10ec0a2bc5fda374617