Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bb4b7d158e9453…

MALICIOUS

PDF

72.7 KB Created: 2021-03-24 01:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 823a34961d3695afe2a14480f0597010 SHA-1: 71fe8de07e8fa9ca8a620bffe5d54bab8669e739 SHA-256: 34bb4b7d158e9453396ae75d621dc13a67045cb3e8692932cbdeb8e030e899e6
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics, including a critical finding that it links to known malicious redirector infrastructure. The embedded links, such as 'https://yafferge.ru/wix?keyword=supply+and+demand+practice+worksheet', are likely used to direct users to phishing sites or download further malware. The document's structure and numerous links suggest it functions as a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=supply+and+demand+practice+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_6029faf32fe5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412909/normal_5fdfafdd99f60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481059/normal_6054f04bdfa63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_5fe791715f380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_605a1173a837d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471096/normal_600b6bfb08ebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_5fd3bd6b67db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476943/normal_602b7dafcc6fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416919/normal_5fccb132a8a0d.pdfIn PDF document text
    • http://zezawuluzata.iblogger.org/s2_netbox_api_examples.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mosepurone.epizy.com/84055303222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/495f2089-78f6-4469-9c8f-c542a04725ee/how_do_particles_in_a_gas_move.pdfIn PDF document text
    • http://rapuwovire.rf.gd/how_long_to_roomba_batteries_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4629f27-968a-4f55-ad86-7447757be7c4/bomupexumusugigekumal.pdfIn PDF document text
    • http://dejoxatumiki.rf.gd/ages_and_stages_questionnaire_42_months.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0000edbf-8be8-4faa-9ffc-12c6fde3ae1e/51292627615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a8174f-aa84-46aa-9277-4785aba64bba/hp_officejet_pro_8620_printhead_error_message_is_missing_or_broken.pdfIn PDF document text
    • http://xidemovuzedep.rf.gd/cefotaxime_mechanism_of_action.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_off0000dd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 5676 bytes
SHA-256: 4b39da0daa7a20b7d3bfe5395851dcc9538b3427c85d0e08fc744814b5a4711d
font_01_sfnt_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 10976 bytes
SHA-256: 1ebb1454c8fdb8ee7e2c485e676a5e219c7fd559d6079895724c892700e1f838

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