Malicious PDF — malware analysis report

Static analysis result for SHA-256 878fb6a82708d5ae…

MALICIOUS

PDF

72.1 KB Created: 2021-03-30 10:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1cc1b35248d5fd50af6adab6059ca371 SHA-1: c351299cd39cb86fd74b6eb938237920148541d9 SHA-256: 878fb6a82708d5ae8b61fa949bb1e098a452ae3c72382fe5990b10e70a3ae09c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm. The primary purpose appears to be SEO manipulation or distributing further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wix?keyword=cloze+test+worksheets+with+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483854/normal_605f526345ec5.pdfIn PDF document text
    • https://mavulirapiba.weebly.com/uploads/1/3/4/7/134741644/fulus-timitopurano.pdfIn PDF document text
    • https://suzitarux.weebly.com/uploads/1/3/4/6/134683800/mapogepefura.pdfIn PDF document text
    • https://rajiketuwomap.weebly.com/uploads/1/3/5/9/135957261/nuxozonumes.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/e08cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379974/normal_60062d9e96f01.pdfIn PDF document text
    • https://gizivesokopupa.weebly.com/uploads/1/3/2/6/132696604/7585601.pdfIn PDF document text
    • https://rudetotupolukoj.weebly.com/uploads/1/3/2/6/132681245/nuzamima.pdfIn PDF document text
    • http://mibafabujid.22web.org/dikobedikekaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/dynamic_electricity_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/baruvuwol.pdfIn PDF document text
    • http://resifidivef.epizy.com/pezubiraxa.pdfIn PDF document text
    • http://patafisowu.rf.gd/john_deere_x320_power_flow_bagger_installation.pdfIn PDF document text
    • http://jimanujomubil.epizy.com/bowel_cancer_screening_nz_guidelines.pdfIn PDF document text
    • http://bibalaluroxute.epizy.com/63141147615.pdfIn PDF document text
    • http://demunoj.epizy.com/calle_y_poch_libro.pdfIn PDF document text
    • http://jabesabokawij.rf.gd/45466573418.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/winrar_for_pc_english_version.pdfIn PDF document text
    • http://dejujerun.rf.gd/french_policy_of_assimilation_in_west_africa.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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 5240 bytes
SHA-256: 991726319e0fbc5a4383827a9b6ba36543209d9ddf7223caae0bfdc208cc09d3
font_01_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 11084 bytes
SHA-256: f9d0cf10c9d7c25ba73d20b03474d511563a22e7801e8cbc00e98c978b15e4ac

Open this report in the interactive analyzer, or submit your own file for analysis.