Malicious PDF — malware analysis report

Static analysis result for SHA-256 79af555e1b72b500…

MALICIOUS

PDF

82.2 KB Created: 2021-03-24 02:15:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2c40d0fa506b23506b433796e03dc124 SHA-1: 5300fbd73110baa049beb3c03600b18890c7fdbc SHA-256: 79af555e1b72b500f3f72ccca7edc1f485d09042a40cf20da8e2c8d9f877df9d
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. It uses brand-impersonation credential phishing. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/8473601.pdf.
  • 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://dugedepap.ru/award?keyword=flowers+for+algernon+pdf+download PDF link annotation
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/8473601.pdfIn PDF document text
    • http://cetakchantek.com/wujarasanq37ti.pdfIn PDF document text
    • http://blockhcain.host/phtls_8th_edition5c58g.pdfIn PDF document text
    • http://shoop-ft.ru/tamil_midnight_songs_mp3_free_downloads7vk7.pdfIn PDF document text
    • http://italysummer.fun/numbers_flashcards_with_picturestcq5b.pdfIn PDF document text
    • https://mixifomako.weebly.com/uploads/1/3/1/1/131164472/0de22fe1dbb3f69.pdfIn PDF document text
    • http://tevfikyuce.xyz/tl-wpa4220_powerline_extenderdpp9e.pdfIn PDF document text
    • http://torchqbfl.fun/typescript_vscode_format_on_savefk62b.pdfIn PDF document text
    • http://intekzafast.online/31310174826s6gvf.pdfIn PDF document text
    • http://kersita.fun/hipaa_guidelines_for_minors14s43.pdfIn PDF document text
    • https://tumunuwixa.weebly.com/uploads/1/3/1/3/131384432/zabizukuwonu_rugax_fixepifuk_patewe.pdfIn PDF document text
    • https://wujuzuvetawi.weebly.com/uploads/1/3/1/3/131379059/4954609.pdfIn PDF document text
    • http://creditscorerepair.info/dovaxozerumane3d9pi.pdfIn PDF document text
    • https://dudunetexuzo.weebly.com/uploads/1/3/1/3/131379759/295746.pdfIn PDF document text
    • http://topsalon.xyz/gcse_physics_aqa_workbook_answersoun2i.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/4b58c04b-e335-4744-b9de-81cadf316e05/how_to_put_captions_on_pictures_in_microsoft_word_2010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b527fe9-62f4-43e0-be47-1e7b930b791b/laritup.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_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 5256 bytes
SHA-256: 0e4c73c2aa4fbdd54c0c198f4f5ce6fa855dfdcd75ed17396ed4364f2bcbd1c5
font_01_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 2664 bytes
SHA-256: 12f776f1fd1c8d8e7dbe0eb4b25e6054bab71abd52647f432755936ea0e70e7d
font_02_sfnt_off00011398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 11040 bytes
SHA-256: 2fdf7f4717d6a3bfe6d9bcd567563dd86056a1dac49a479838413ac2e5eff3b3

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