Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7f0efd8996d544…

MALICIOUS

PDF

79.3 KB Created: 2021-03-22 17:35:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b06cfd6f065d9096a93d521691dcebab SHA-1: ea015c05b7d4188b5cd6e024c30d80b917ae0e01 SHA-256: 7f7f0efd8996d5445614c8c7dd3011c7b2b6cb4ce2bd45707a455d46cd89b42f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://resalured.ru/strik?utm_term=auld+lang+syne+poem+summary PDF link annotation
    • http://secureappeal.com/how_to_say_let_us_pray_in_latinffb9i.pdfIn PDF document text
    • https://cdn.sqhk.co/genonitag/Ouid9Kh/namewibetoxuxox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_602690d4799f1.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/hDTifhc/ana_slide_water_adventure_3ds.pdfIn PDF document text
    • http://abreudesigns.com/zifomezurowovalyw3js.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419626/normal_60086dfdb9a6c.pdfIn PDF document text
    • http://bbflowers.net/oxford_english_grammar_course_advancedav892.pdfIn PDF document text
    • http://varistop.site/mufepowefulelimufazebeladfbszr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jugebifa.epizy.com/fazogoloza.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_d912c8f1ac6d4ab997e2e4ed4e21c2fe.pdf?index=trueIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_8c78b50973e24302a8876437d58a6d1f.pdf?index=trueIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_914ff43ecaf04affbacd59eb96f7e031.pdf?index=trueIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_2a62d248fc6b405896a85bd99868c53c.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_a67c71a71afa4eb1ae14b94b912f7138.pdf?index=trueIn PDF document text
    • http://zusutifosaj.rf.gd/tafexugatita.pdfIn PDF document text
    • http://petefedugekuk.rf.gd/doppler_effect_practice_problems_worksheet.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
font_00_sfnt_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 5124 bytes
SHA-256: 0f058c8efa4c31c96f18398ab26095e510aaf34ba2db7ebd6d8ffdfad113aad7
font_01_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 10584 bytes
SHA-256: e15df2b6d9054f6b75757d36553f55b43d7f00ccc18a3d760f142732a5149a62
font_02_sfnt_off0001223b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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