Malicious PDF — malware analysis report

Static analysis result for SHA-256 1518f28e41a8d514…

MALICIOUS

PDF

72.6 KB Created: 2021-03-29 18:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 98b3c1459ae92c47c40306de45089d23 SHA-1: dfd2d3235cf71110b4e7fad1d639ecf3e552d78a SHA-256: 1518f28e41a8d514dbba75bb7d6dcd10a4ae40c89fa56a56310841284f83843e
196 Risk Score

Malware Insights

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

The PDF file contains a mass external link farm and an SEO redirector, indicating a phishing attempt disguised as helpful content. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, particularly the redirector, are key indicators of the phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/strik?utm_term=why+is+the+water+not+working+on+my+refrigerator PDF link annotation
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/bizeperoripoz_xaxajudazir_kuxegumawisu_bupowelewez.pdfIn PDF document text
    • https://cdn.sqhk.co/zepigelona/hjUB9jc/xubutumemipuret.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/vabus.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/poxamogunis.pdfIn PDF document text
    • https://lidixegivutowo.weebly.com/uploads/1/3/1/4/131453330/gelolomaz-vezuxatulu-seridigixuxe.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/7a5050.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/hjiedjb/outwitt_granny_mod_menu_pc.pdfIn PDF document text
    • https://tutonaxubetu.weebly.com/uploads/1/3/5/2/135296536/rakojixig.pdfIn PDF document text
    • https://kiloroxo.weebly.com/uploads/1/3/0/8/130813762/wosogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_58ee41520f5047cd85b33ab7936ce0a5.pdf?index=trueIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_d5807fb86d6b45898f1bb22030c47663.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_b3b1fd1669dc4505a37c78c3a51bed17.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_a872ec91405e40c1b8f21e406c44c4ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/92959234326.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/jelaguvevebesosutasoni.pdfIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_f4a1257614d44bf2bc7c0f55c512c6d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/60042019767.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/56217823642.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_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 5420 bytes
SHA-256: 128865f5730c104f67dce505e0fa5219b4b87bdca4ec224d03af1413812d922b
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 10548 bytes
SHA-256: b042b0de3ca0734fcb96bdc5964bf0f95c8a3bb7d8dd645384723dd0707b0256

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