Malicious PDF — malware analysis report

Static analysis result for SHA-256 959447df9a732c73…

MALICIOUS

PDF

71.0 KB Created: 2021-03-22 10:30:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8190270cd959683f6f8ebd7b511e8793 SHA-1: 59070c05f61b80d33a5ef4eeca61f79a8a06a972 SHA-256: 959447df9a732c731023c72ec2acfae9f57a5e5037d6ed455892cf9bd2beda39
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://crophysi.ru/wix?keyword=addition+of+vectors+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365600/normal_6010005756d37.pdfIn PDF document text
    • https://xenolato.weebly.com/uploads/1/3/4/8/134868471/9922500.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/hbjfgcB/vulogu.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/ibzsack/business_plan_template_word_document.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496586/normal_6054919380326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_60104d73c752c.pdfIn PDF document text
    • https://gaburidukir.weebly.com/uploads/1/3/4/4/134463400/589ba647b77555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465127/normal_60463d392d6d8.pdfIn PDF document text
    • https://dodemitewiv.weebly.com/uploads/1/3/1/3/131380707/2a2648609c29a3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_1c3e17e85784483ea892db73ae49de34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6c13f75-c9dd-4a2f-a0de-ca362af9a7a3/11188732752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d15ae3-b487-41f3-916d-acac48e63bd3/gigotada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cb17e18-a93f-4f93-ad50-f6d711688e61/raxipewufonuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48799af-2c30-4562-aea9-35b34883273a/positive_thinking_quotes_hindi_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5de1a65e-c969-4cda-b878-29e4f9348301/xagawinikeviviniwikofuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c051a3-853b-4791-909e-350c29cd2111/28421253485.pdfIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_7960e2ac68e245e19bb06fa0ab6ef69e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d81629e6-bace-4831-aa6e-c280b65d248b/17952825280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee45a80f-5f20-4ab9-9dde-27dd53753f05/avaya_one-x_communicator_headset_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63143773-1618-4e55-b64e-1ef486897b43/pentair_intellichlor_ic40_cell_cleaning.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_off0000d537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 5284 bytes
SHA-256: c2e8bab3347fffe143bf2eef802915f5bbadafe6362f0e67f87474b24c026457
font_01_sfnt_off0000e749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE749 10780 bytes
SHA-256: 8d69a5952b1aef75032c90326770a8b3736e945dfc71b3058672cc2f68e0d662

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