Malicious PDF — malware analysis report

Static analysis result for SHA-256 f529665821aa331e…

MALICIOUS

PDF

98.9 KB Created: 2021-03-17 16:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fdfda9e907f296ccaaa6940e8c99edc SHA-1: 7e53516f07d29febbc501388c015602fd6ad388a SHA-256: f529665821aa331ebb2cb46dc99ce8d36356b238bb51fdb9583a273201fd484a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly domains, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=what+does+integrated+headset+mean
    • https://dafelubuvotaxid.weebly.com/uploads/1/3/4/7/134753950/8926413.pdf
    • https://mezuxanivatanid.weebly.com/uploads/1/3/4/4/134499991/wenufuperaw.pdf
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/ba3f7e8f7ed4852.pdf
    • http://lojapidabud.mypressonline.com/how_to_operate_a_hunter_thermostat.pdf
    • https://netevidogewe.weebly.com/uploads/1/3/4/7/134715311/dutetipepigerus_xugaxalik_judafi_galowinepibo.pdf
    • http://kadanijojabuf.mywebcommunity.org/15245490380.pdf
    • https://javufivupa.weebly.com/uploads/1/3/4/3/134349262/vezodanepu.pdf
    • https://bugalesatu.weebly.com/uploads/1/3/4/3/134309104/4342128.pdf
    • https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/kulixewuzozo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wogikokuzotaxa/satebugejifamax.pdf
    • https://eac0579d-2b87-4914-8851-edb43a0cfe7f.filesusr.com/ugd/bca722_c8bc2e1b3b254e7794bab37877ea46dc.pdf?index=true
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_1cca0a174da144bbaf6cfddac3e98040.pdf?index=true
    • https://s3.amazonaws.com/mixanaz/bulbulay_3gp_video.pdf
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_2c3b004a32614338962a4e6c473fd3f0.pdf?index=true
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_adfc01c2b64f466a98492e43b57b5645.pdf?index=true
    • http://paguxesij.myartsonline.com/bill_nye_energy_answer_key.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146de.bin
8249ec35af3114e235d3a7766796fbc107447321b56c08c5295b69ebfb7d7816		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146DE 5220 bytes
font_01_sfnt_off00015880.bin
1b0a8171d1618f147cc89488026311a0675cdd81a892d65648eb15ccd708e71e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15880 10968 bytes

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