Malicious PDF — malware analysis report

Static analysis result for SHA-256 684b8e5444d52036…

MALICIOUS

PDF

85.9 KB Created: 2021-03-28 00:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 10d0698532dad32723cd992077b2275e SHA-1: d083eaa1b0532c497f133601c473e4a09378ddf3 SHA-256: 684b8e5444d5203651063b84fd51879fc504a0710090ac59b4a2ef75910c6eee
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, likely serves to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/award?keyword=access+consciousness+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476925/normal_5fca7d8631cef.pdfIn PDF document text
    • https://tazapupexon.weebly.com/uploads/1/3/4/6/134634001/tidigim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384152/normal_5fe0aa8762945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_5fd64c6fa2484.pdfIn PDF document text
    • https://bolamowoxuwev.weebly.com/uploads/1/3/3/9/133997192/8288985.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/64dea03.pdfIn PDF document text
    • https://rezapikuxodet.weebly.com/uploads/1/3/0/9/130969426/wukijezujudig.pdfIn PDF document text
    • https://xomuwesakutizid.weebly.com/uploads/1/3/5/3/135393414/3839982.pdfIn PDF document text
    • https://nurifekuti.weebly.com/uploads/1/3/4/5/134516663/fodosusinejula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_d4457d956c35490f8528b092017d6006.pdf?index=trueIn PDF document text
    • http://vepisesilutez.epizy.com/31039226674.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/rearrange_sentences_worksheet_for_class_6.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/wifi_hotspot_software_for_laptop_free.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_4b61a234c48448f2a47e026ebfdc7ebb.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_abc5a1bb2c9b4f65971564831cf839b0.pdf?index=trueIn PDF document text
    • https://78fc25e8-d533-4ec3-a480-3617e8cc0d4b.filesusr.com/ugd/aa5866_238024e461564fd08435b1be7c5efcbf.pdf?index=trueIn PDF document text
    • http://nutukame.rf.gd/wazevobofavuwixiruf.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/when_does_modern_american_history_begin.pdfIn PDF document text
    • http://kusugafunerepo.rf.gd/beauty_plus_full_cracked_apk.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_c174563441f54b559755846f2fdae574.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 4600 bytes
SHA-256: 2388aa9619155b216b35f1af7c38a5c397ea2b13fcc39edfc4b38739c2f935bc
font_01_sfnt_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 17832 bytes
SHA-256: 943296eb6b111ffc1e600d90de5ab71cd8e3401c09bf68d8dc4b87178854fb4f
font_02_sfnt_off00012479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12479 16324 bytes
SHA-256: a9469ecb319ff6068c72c02b87e7958647aca6e5ab6c86b747ade65ccdd69fbb
font_03_sfnt_off00013a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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