Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8853583a08a2762…

MALICIOUS

PDF

86.7 KB Created: 2020-12-22 18:43:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6e7328e9d14a94b4e67f100bebf5ffb9 SHA-1: 1e3bc4eac398f891e1d14b7264a243e282d63394 SHA-256: b8853583a08a2762bab7fc3e42b6310b4e19e4cb3ddc3bc7f9e3000622d87be0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

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 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://trafftec.ru/strik?utm_term=brain+games+season+5+episodes PDF link annotation
    • https://zexajupa.weebly.com/uploads/1/3/4/6/134692079/605d47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366362/normal_5fc931bced406.pdfIn PDF document text
    • https://bobepeduzogir.weebly.com/uploads/1/3/4/6/134673546/bajigatuni.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/32e063a95e.pdfIn PDF document text
    • https://razebefalokugex.weebly.com/uploads/1/3/4/8/134895215/nofuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_5fd957333f331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_5fd0fa4f1fbf9.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
    • https://uploads.strikinglycdn.com/files/82d362ce-4f2b-47b1-9c5b-08aaac41b949/photos_et_videos_dandrea_valdiri.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59989c14dfd36fe117a88/t/5fcbf25a3ff1011540da45fe/1607201373936/dead_trigger_offline_zombie_shooter_hack_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c03009bf-d73b-4f39-8f59-0aa488eab2a7/vebore.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e8580a2757459be2e8d5/t/5fc6288061e25426e10a0722/1606822017956/tennessee_titans_covid_list.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4ca9c17e7202640030589/t/5fd601e4c4373837b900ae6a/1607860710106/casino_games_online_free_play_no.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 3016 bytes
SHA-256: 6b1886100909a5777bb30fc7b7be00bba8ed48ad5f5b392b7a0cb4783a0739ac
font_01_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 5128 bytes
SHA-256: abe60ad92f9d2a498930c369a1217ceea72a5747a358d1d1701ad9909d29aef5
font_02_sfnt_off00011c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 10348 bytes
SHA-256: cfdda1448a3feebab1d4010c9dbb17114c3f0f2735975f26f306d2cd1bbafa27
font_03_sfnt_off00013f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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