Malicious PDF — malware analysis report

Static analysis result for SHA-256 c935b863f7a5816f…

MALICIOUS

PDF

80.3 KB Created: 2021-04-06 03:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9c6b94c0404eddff445c979761c856af SHA-1: 7747c0ea8091dbee89c5ed03328d4b5e96dd0915 SHA-256: c935b863f7a5816f2f070d9e06dbf3a001bb31643880f89fffd9b0b05f9b0d86
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with critical heuristics indicating it's a malicious redirector and a link farm. One of the primary links directs to a known malicious redirector, and another points to a PDF that is part of a link farm hosted on disposable infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malware distribution intent.

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
  • 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 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.
  • 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=boom+beach+mod+apk+download+private+server In PDF document text
    • http://finovadi.iblogger.org/jcb_4dx_technical_specifications.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/jjib1Dh/twisted_sugar_skye_canyon.pdfIn PDF document text
    • https://cdn.sqhk.co/temududote/b68FMhe/duzugezimanigusu.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/c2TObU3/norijosupuku.pdfIn PDF document text
    • http://rufikive.iblogger.org/zufoxovudezedanasixof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_8d158dec01574c9195e255bcfd8e3aa1.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_7912bb33959d482bbdb8506919d92e83.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_50c4ba5ba4764dfaa0242b61b8afe104.pdf?index=trueIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_7393265cc0f9410c8e5d2d282c53b881.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_743b1943a6694055bacd7a741aa020fe.pdf?index=trueIn PDF document text
    • http://xuxusemo.epizy.com/we_the_arcturians.pdfIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_fe162faad0ea461e97525928ba4c271e.pdf?index=trueIn PDF document text
    • http://porojerosisogu.rf.gd/61391046192.pdfIn PDF document text
    • https://b42dfab6-8227-42c4-8fe5-fc04d9433513.filesusr.com/ugd/a9a8df_e459a9bc37da48b5bd78547e1129e9b7.pdf?index=trueIn PDF document text
    • http://mapupove.rf.gd/kimenixinari.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_cbe59e7364684b959c92a6ac538ecf6a.pdf?index=trueIn PDF document text
    • http://zefixufedinokas.epizy.com/25993994225.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_17fe9ecbc6b342c5816b06bab0c42274.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_95ab8c01358d4b5a877a69bf6b9d71dd.pdf?index=trueIn PDF document text
    • http://tononade.rf.gd/90731298870.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_fa124c8d357e47f5a7305adce8109e9b.pdf?index=trueIn PDF document text
    • https://801a9f91-e12c-4b3a-b535-42c3eaff61c8.filesusr.com/ugd/d237ef_9ea00a3d7f9a44c1820de3bdf66dcada.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_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 5716 bytes
SHA-256: b43f59d00d18312088264ff5d6ab7c66dbb6782468497c908cf4ba07acf1dea7
font_01_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 10420 bytes
SHA-256: b47b04930387409036a5b58e3ec2eef7a4e99630bdf95319b7c0746834ab22b5

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