Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff57ba1d854f932c…

MALICIOUS

PDF

90.3 KB Created: 2020-12-13 13:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6c27b82fefde3dc4abdcfd1fcb5793b6 SHA-1: dea31c69c9b04c0b661d17ba34511f3cad99ab0b SHA-256: ff57ba1d854f932cbb15e6ff084e8e6311b19dca9a3765850e1ea2c4a710ccbc
156 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 0.9997

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=fiu+tv+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472753/normal_5fb7cd0db582c.pdfIn PDF document text
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/wonavif_kasabos_lerixap.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/suzidowi.pdfIn PDF document text
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/9911025.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/1bb713a8-da74-4844-a242-75a73c908db7/82822452103.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/46746283120.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce1866190b057dd37e3170/t/5fcf4e11798354522d0cf2cd/1607421458022/australian_superbike_championship_2020_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/fofubemawaxojezazatibep.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/fitness_connection_cancel_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56926a13a450bab12a87b/t/5fd1c22923f2866aa388ebae/1607582249971/luke_combs_sounds_better_together_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/baylor_spread_offense_playbook.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c362403f5353fd950a5e/t/5fc13377fa04221c714b2cfa/1606497143738/my_fair_lady_worksheet_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2d70d1c8c7413143e99c9/t/5fc92be8eeb28229209f5269/1607019501796/run_rate_formula_example.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdf7b2b9ec03672fa6d5d6/t/5fd02f393bcf75077a79d44b/1607479097783/tazamivikafutopapizirex.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 4492 bytes
SHA-256: cec970e1f441ad6c92a529f33b59e800595c7799f7569b3c9611d8cbb475b764
font_01_sfnt_off000111d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D8 12748 bytes
SHA-256: 0fc82ead3815d272e14d1babc377b32489a1f6325d4f25b121f3f465f9376830
font_02_sfnt_off00013ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC9 19608 bytes
SHA-256: 5331b0374cfdb229483eb2d7981ba61d944a3448a0f5b8bf80508df578c30956

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