Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf8ccec58e3eaca…

MALICIOUS

PDF

81.5 KB Created: 2021-03-11 10:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 21830dcb3a05b27a4bad8a4dcf11f051 SHA-1: 58ceccc62fd56224e7bf475a64dc0772e0cb3f59 SHA-256: abf8ccec58e3eaca585572e18d86604c6b07b4d5637372a8b00f42e4f6fa0f5f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://fokemale.ru/award?keyword=synthesis+and+secretion+of+thyroid+hormones+pdf PDF link annotation
    • http://batmbatm.ru/werewolves_of_millers_hollow_scriptq9ya1.pdfIn PDF document text
    • http://hightrade.club/la_republica_de_platon_editorial_gredos2lmwx.pdfIn PDF document text
    • http://esmoney.site/hard_and_soft_news_slideshare1k0zn.pdfIn PDF document text
    • http://wonder-ita.space/wojukod4ern9.pdfIn PDF document text
    • http://neo-tp.ru/vermintide_2_crit_power6zdvs.pdfIn PDF document text
    • http://blekrossi.ru/4498125190fq39x.pdfIn PDF document text
    • http://natfreshik.fun/kugenasuzaneduwafa6bxkl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_77cd9e151fa1459a83639cd4d26771fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mutirexa/nosovunavozokupalib.pdfIn PDF document text
    • http://sulupajus.rf.gd/english_reading_comprehension_worksheets_3rd_grade.pdfIn PDF document text
    • http://nupituf.epizy.com/xewinelinapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5ea599b-fc86-4ec2-bbce-6d6f7ddabd44/sig_p226_p229_magazine_compatibility.pdfIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_635a776ad9284b0da66ae16cd14c9f1e.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_76edbc0791c84c7ab5ec8f60ede3f334.pdf?index=trueIn PDF document text
    • http://mupufuten.epizy.com/hp_laserjet_p2015_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c407d0e-caff-4ffb-b660-cc51d83dfc9b/what_are_the_dimensions_on_a_55_inch_tv.pdfIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_1db0a99f896c4b34adf9a659c10864d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/how_long_do_stock_trades_take_to_settle.pdfIn PDF document text
    • http://fumojaj.epizy.com/29807024548.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_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 5568 bytes
SHA-256: d91ea2c3f4630f5101f50c8593794dcd96d188b0c15ba5756af70359045be24d
font_01_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 10700 bytes
SHA-256: 2dbc0e45d5f1821ba97998a29b38a21ef18dd6e1fb7da6af07bf893f12e933cc

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