Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ac69ae14bf2fe8…

MALICIOUS

PDF

82.9 KB Created: 2021-03-16 08:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: da779fcaa9ec8b32a1c5f37f9d200d5f SHA-1: 738e0b2717af97bc04fe3f688073c93a79fa9efd SHA-256: 40ac69ae14bf2fe8a3093bce10f8a0a261140e94de581898b9e6ecbfeafe74e8
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to SEO-optimized redirectors and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the document's structure suggest it's designed to trick users into visiting compromised sites.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://pelibifir.ru/wix?keyword=toro+622+snow+thrower+manual PDF link annotation
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/kuzopetugoki.pdfIn PDF document text
    • https://cdn.sqhk.co/pegebatanuz/ZWoAIgi/rirasaramidoregitize.pdfIn PDF document text
    • https://joxedobiwot.weebly.com/uploads/1/3/5/3/135350216/torodolodexutomudez.pdfIn PDF document text
    • https://cdn.sqhk.co/zokasejiz/dhblxjg/heroes_2_the_undead_king_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/iiLTje1/97386406302.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/87272c039aa3.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/gowebabuxogiro/ganapati_atharvashirsha_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92127570-008f-4d23-89e0-c3c4b1fef74f/kivisefonamawobo.pdfIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_42aef2aee17143c0b568601a7ed22e6d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leributafa/canopic_jars_fact_sheet.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_35c704aa9b4649a29a32c7210db73936.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genedesowul/android_autocompletetextview_custom_adapter_kotlin.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/97942669558.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_9e6380f145bc4c729bc907a1c4ec9a03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/852688bc-84d9-48fa-bdf3-f47b1344825e/maxi_dress_for_daytime_wedding_in_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/jasaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb56699-138c-447d-8595-120f0d5c09ce/defending_jacob_ending_explained_book.pdfIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_b7bbb26aef3e47d68085cfb04533d3eb.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_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 5252 bytes
SHA-256: ad3a4ef89f7a0242c3e16592ac353d3dff767bd1f5f74dd6abb6cbeb8863f906
font_01_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 11164 bytes
SHA-256: 4dab607626499e09a98a820655e8a5ca3dfaed7b233d32ab3e22afa269352226