Malicious PDF — malware analysis report

Static analysis result for SHA-256 7064a83d37353023…

MALICIOUS

PDF

87.8 KB Created: 2021-05-20 00:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 156c911e03068a4ab873716ec41954f1 SHA-1: 21eef1493a546310ca495609058a03bf3651d36a SHA-256: 7064a83d3735302377f8fac2af033aaaaba7c20d9c3d8b2dbd0100ab3e6eb8c8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to search queries, directing users to potentially malicious external URLs.

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://leonvi.ru/strik?utm_term=will+fifty+shades+of+grey+ever+be+on+netflix+uk PDF link annotation
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/3076778.pdfIn PDF document text
    • https://labuxodapiju.weebly.com/uploads/1/3/4/4/134492440/bukekapagosezasum.pdfIn PDF document text
    • https://jodemugibinid.weebly.com/uploads/1/3/5/3/135347277/rubedufuxene.pdfIn PDF document text
    • https://fikejibin.weebly.com/uploads/1/3/4/3/134331262/punenafanunu-gamukeweluxidi-zuvaninenuxo.pdfIn PDF document text
    • https://fukenavu.weebly.com/uploads/1/3/0/8/130813663/8588418.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/1a7b4d81eb6eb08.pdfIn PDF document text
    • https://lofidebonejiniz.weebly.com/uploads/1/3/5/3/135334880/xisedebug.pdfIn PDF document text
    • https://timodidub.weebly.com/uploads/1/3/1/3/131379596/9213746.pdfIn PDF document text
    • https://xunipemadigorof.weebly.com/uploads/1/3/0/8/130813553/dimupiralazuwa-pizugaw-mupiwegoma.pdfIn PDF document text
    • https://gumopokexu.weebly.com/uploads/1/3/0/8/130814161/xobapewikawidud.pdfIn PDF document text
    • https://gosasaweju.weebly.com/uploads/1/3/1/3/131384289/1104050.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/kudowo/revelation_to_john.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b9215da-92ae-4aaa-a05a-5331260363ed/76983689555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05deb9b1-2e39-4495-9ea5-b5f565c54905/61893340521.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/2775465918.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/zexozabonajilevibiwad.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/sonesututere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e45429bd-5946-4bf0-9b48-e2522df4eefc/wevibawijuxugasirexu.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/sarejuxofulevupewivevu.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/online_passport_application_form_fill_up.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off00012f2b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12F2B 20696 bytes
SHA-256: d37e105551df925525382683b07bdc1f9aaa9d7590f9a3f5254768e2c967b3c0
font_00_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 5616 bytes
SHA-256: 739905ee09eb25e98fbe71ac17c7ffba6f3104f6fda1d3d4a3f450885399b359
font_01_sfnt_off000106cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 12100 bytes
SHA-256: a4dc23a4e5be4bec024b6b6e2d522b3f09d4ee43565244eb1f4bcbd340305a93