Malicious PDF — malware analysis report

Static analysis result for SHA-256 febbb791b366b5a0…

MALICIOUS

PDF

86.3 KB Created: 2021-03-22 02:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a64df00fd0f90eda898dd096462d929a SHA-1: 11199a0baa1e2caee25a06521daa07fcc2061fec SHA-256: febbb791b366b5a0a63a13a566e629fd8695bea6410577410028d1ed4639cb1f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic findings point to a link farm strategy, with numerous external URLs embedded within the document, including a suspicious URL at 'resalured.ru'. The document body, though heavily obfuscated, suggests a lure related to an installation guide, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=foscam+fi9821w+quick+installation+guide
    • https://cdn.sqhk.co/kudozaporuro/iygijif/space_pinball_classic_online.pdf
    • https://wazolupagod.weebly.com/uploads/1/3/0/7/130775763/lumemagewotaxejez.pdf
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/vokuwope.pdf
    • https://lusizemanu.weebly.com/uploads/1/3/4/1/134108609/bofuferubenufuz.pdf
    • https://cdn.sqhk.co/lasetipulos/jajgIhy/62689143245.pdf
    • https://xogalorezekulim.weebly.com/uploads/1/3/5/4/135400954/7057346.pdf
    • https://cdn.sqhk.co/wovupeni/Ljeghj5/49393333179.pdf
    • http://girepodemaz.getenjoyment.net/ring_theory_abstract_algebra.pdf
    • https://cdn.sqhk.co/lilapanorup/ehajfS7/dress_coloring_book_glitter.pdf
    • https://cdn.sqhk.co/vibebexez/hiIShcD/border_patrol_checkpoints_2020.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_a96bb56462e24143a96b45870dba5857.pdf?index=true
    • http://nedizilunok.myartsonline.com/xetokofimavesasagomemaj.pdf
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_b63515eff5c346909ac240ec15b31aa4.pdf?index=true
    • https://s3.amazonaws.com/mukutud/jowatusof.pdf
    • http://pekowob.onlinewebshop.net/72405057049.pdf
    • https://s3.amazonaws.com/gapuruxumeg/free_music_albums_sites.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f906.bin
7b9c1ad248dcaef01c7adb4df71c22141da68cde87cc5ccff7cadb2d821898f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 1768 bytes
font_01_sfnt_off000101ac.bin
f4017b920fc60a83f4ac7c412e0dd34ec64f11fb337f5392d2f89b907e31928a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 5900 bytes
font_02_sfnt_off000115c1.bin
77b07d6feb33c6620127d02539945f479233edd9d28371e4e4f2f7f592a4ab08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 11048 bytes
font_03_sfnt_off00013b63.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B63 4324 bytes

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