Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac50e64f9d3dd2a9…

MALICIOUS

PDF

71.7 KB Created: 2021-02-16 07:38:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5c3008686107be18ea7d62b2fe91c682 SHA-1: 58f0f1ca43346824b4b7f5cbfd204294bd8ffe3d SHA-256: ac50e64f9d3dd2a98879cf1f11e2d8809e3ec30c3363ecb0592bbbaabb919f50
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 0.9997

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://druttle.ru/wix?keyword=aroma+rice+cooker+user+guide PDF link annotation
    • https://cdn.sqhk.co/jowapezo/gcnjhje/96242532659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485939/normal_60159b3903b53.pdfIn PDF document text
    • https://napokepuwaju.weebly.com/uploads/1/3/1/1/131164128/vodobez_kudawujuzowe.pdfIn PDF document text
    • http://douchely.xyz/antibacterial_activity_of_azadirachta_indica9a9yf.pdfIn PDF document text
    • http://italysummer.fun/chloroform_storage_compatibilityqhmk0.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/hbhbifP/note_taking_methods_for_adhd.pdfIn PDF document text
    • https://cdn.sqhk.co/labojime/iaUZZST/air_hockey_tables_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_5fd8f68b7544b.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/jdifheU/instagram_hashtag_winner_generator_free.pdfIn PDF document text
    • https://fiwofufoneronup.weebly.com/uploads/1/3/1/0/131071066/2951896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_600fb99843d22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483335/normal_5fed313da3998.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/4984400890541om7.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/setigafat/i_hereby_authorize_letter_template.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_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 5280 bytes
SHA-256: a91f0a4936df304a5360cddb2613db4d9e7a0db604789395998970e80e1d7c44
font_01_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 10216 bytes
SHA-256: b4a35e5ea78acd4a1d3ac9dc420b41d96d915a8a7cc3a8c634f3567ab7cfd7c6

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