Malicious PDF — malware analysis report

Static analysis result for SHA-256 f612bde8d96c375e…

MALICIOUS

PDF

79.1 KB Created: 2021-06-09 11:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6f2d963cddc1a915b8b2ff805c0e728c SHA-1: 83e32e553976e5a2295adb37c53dff1942a3d22c SHA-256: f612bde8d96c375ee1e692c1d93f5d2e9f712328c7b71a75dc7dc4d978817f8b
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/pbw?utm_term=watch+oldboy+123movies PDF link annotation
    • https://gafujewat.weebly.com/uploads/1/3/4/6/134687801/xojejavi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388060/normal_5fe49f033274c.pdfIn PDF document text
    • https://vopukuno.weebly.com/uploads/1/3/1/3/131383764/877340.pdfIn PDF document text
    • https://ribosotegolexo.weebly.com/uploads/1/3/4/0/134013239/9933519.pdfIn PDF document text
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/mopozit.pdfIn PDF document text
    • https://kumupesefutevun.weebly.com/uploads/1/3/4/4/134463509/2082712.pdfIn PDF document text
    • https://tejojapifofomo.weebly.com/uploads/1/3/4/3/134339563/e17bc4c.pdfIn PDF document text
    • https://dijavagom.weebly.com/uploads/1/3/5/3/135325372/7878877.pdfIn PDF document text
    • https://ludajajuxo.weebly.com/uploads/1/3/5/2/135293479/managa_fenopiko.pdfIn PDF document text
    • https://woxolifufoku.weebly.com/uploads/1/3/4/2/134234665/6678057.pdfIn PDF document text
    • https://mapimodedafibo.weebly.com/uploads/1/3/4/7/134708703/zupotavirilufi.pdfIn PDF document text
    • https://wajogivetiwi.weebly.com/uploads/1/3/4/3/134322864/xoxifamem_lojofunusum_xasesodafizeva.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/vozaragubapobemananu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4463275/normal_60b134b918506.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fotikeralo.pbworks.com/f/lalokijobopesuwiku.pdfIn PDF document text
    • http://wikifuvuz.pbworks.com/w/file/fetch/144869685/how_to_answer_email_phone_interview_invitation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe218309-1162-4554-bf35-a6e792baa5e0/gta_vice_city_cars_mod_apk_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab2d0a7d-6111-4207-97b9-9f5e8508fbb6/36869033876.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_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 5744 bytes
SHA-256: 8b6b2b52e2bf54be1d98ae46976100c766238a10c3a428a0f7061352a822526a
font_01_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 11376 bytes
SHA-256: 92c2f511b11733ebd0bc75f2ca88b2d632bd8267439add9fb10d2d77e6c1eef7

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