Malicious PDF — malware analysis report

Static analysis result for SHA-256 6defacda0d6be172…

MALICIOUS

PDF

75.9 KB Created: 2021-03-25 03:16:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 246fdbd86b7f49ac77712a62b09ac32f SHA-1: b3e9d79f7c5af3e0e8b7370385a3988f26806cf0 SHA-256: 6defacda0d6be172f7dcc3239e57e318e0785ae2da2bd461564ba6d99ad79c5d
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. 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 0.9999

Heuristics 6

  • 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.
  • 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://crophysi.ru/wix?keyword=arc+length+calculator+radians PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367905/normal_605bc9e14142c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_600e45c1a78ae.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuruvew/egcVhgO/play_piano_lessons_2019_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389801/normal_5fe8f5b135221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403410/normal_5fdc4ecf4b25f.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/ophelia_lumineers_piano_sheet_music_free.pdfIn PDF document text
    • http://lutafem.getenjoyment.net/74121104691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501791/normal_5fe710127e0d5.pdfIn PDF document text
    • https://cdn.sqhk.co/lofesaxudiwo/ahbha5Q/lizekod.pdfIn PDF document text
    • http://tonukavugu.mygamesonline.org/kuvulemuwigumebovugelu.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/ejjh6jc/33859336947.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejideba/android_keeps_booting_into_safe_mode.pdfIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_b22906f9726b4b7faddd307c59fefd66.pdf?index=trueIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_6e6a66c8aff442b4bf08f5e36471cf5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/57882714821.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/alif_ost_whatsapp_status.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/wrecked_2009_full_movie.pdfIn PDF document text
    • https://1dfef493-bba3-4db0-89f7-7cef958ceea2.filesusr.com/ugd/3dbeb3_9fb7fe543c954a58919111a1eec9a892.pdf?index=trueIn 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_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 5192 bytes
SHA-256: 3f4fa35e1fb9bf5833569830785a67bd2fc22608d3de8a36d0d2332e30fde4a2
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 12332 bytes
SHA-256: 6fbe72255d3da9a4c8e641ad0a53c37a78e5d932b7707f6549d24b28fc1c7079

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