Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8615d901bcaf3c…

MALICIOUS

PDF

77.5 KB Created: 2021-03-25 12:10:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 98f532b6219f774362ad4c4ce89c3d12 SHA-1: d3e537b49068f617259dd5e0e1951e71aea47850 SHA-256: bc8615d901bcaf3c59cec7c6419f70c2199b0b3a4daf743c0c71283d384d4c89
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=fractions+worksheets+pdf+grade+2 PDF link annotation
    • http://emirofficialzm.com/davaserogie2kj5.pdfIn PDF document text
    • http://helper-badges.com/dafibiwibuluxasul1y37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_602448d97f707.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428078/normal_5fc6bd51e3b88.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/gfRgdwH/72158284886.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/gfhcdhc/hatsune_miku_offline_music_like_magic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_6044f452c9932.pdfIn PDF document text
    • https://cdn.sqhk.co/nigezufi/j0heeIk/railway_platform_singer_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_604adb0c50f92.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/shGifja/17795810101.pdfIn PDF document text
    • http://uscreditcheck.info/ninestars_garbage_can_replacement_lid5re5s.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/t3Ik6jd/sims_4_zombie_mod_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/besawevij/ibheihe/3627735663.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/hggegdC/52707296501.pdfIn PDF document text
    • http://mexicotop3.xyz/11401514697s3p3n.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/efx4W1J/50425758189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419832/normal_6047eb27cd68a.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/ba6a16fa-b769-42aa-8679-5d89d6fb899e/timeropubifutefuwejozud.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/video_show_pro_apk_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/asean_and_member_states_transformation_and_integration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28403146-646c-4952-be41-5539c03e6540/buluni.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/58904024980.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/xuxenekibozu.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/26240143096.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_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 5628 bytes
SHA-256: e3a57ebefceedd981cffb94fc1b301174021b7e8f79ff74a9e95ad87e3156a09
font_01_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 10324 bytes
SHA-256: 935d135b5c5803731b39ab32ddd16c7586309b662118681d811ca7f7477fcc8c

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