Malicious PDF — malware analysis report

Static analysis result for SHA-256 a193efacce56eb75…

MALICIOUS

PDF

83.4 KB Created: 2021-02-09 11:37:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7a3f08ff372a9140efa01caa3343b868 SHA-1: 575604b4a26b565c4a1610caca0c27487cfac69a SHA-256: a193efacce56eb754759389e404af52f6227938b7b039b2011fe2303ae9fd189
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, specifically for containing a large number of external links pointing to redirectors and potentially malicious content. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded links suggest a phishing or content-farming attack, likely intended to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://crophysi.ru/aws?utm_term=free+accordion+mini+book+templates In PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/ge6LQIw/pikifusutepizofuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/ygffial/peganoleketegofovepagol.pdfIn PDF document text
    • https://cdn.sqhk.co/dalogunutixo/Kiiqojg/dukotoliva.pdfIn PDF document text
    • https://cdn.sqhk.co/duwokarewesu/giPQfli/26786415222.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/9GtAVdO/32519152329.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/8998783.pdfIn PDF document text
    • http://ruwegekugite.22web.org/59958382336.pdfIn PDF document text
    • https://cdn.sqhk.co/sewizefaxiki/dse9Ijc/battle_of_the_bulge_1965_watch_online.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/DkjiU3v/nokoxowopabesivo.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/hajgigc/gumifetumijegezeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zapidijerazavot.epizy.com/adjectives_and_adverbs_worksheet_2nd_grade.pdfIn PDF document text
    • http://buzanone.epizy.com/windows_10_1803_update_file.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/difference_of_two_squares_worksheet_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/accepting_an_invitation_letter_informal.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/77652932808.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 5380 bytes
SHA-256: b059bbd28cfd7da135187e4ac4cc5234d54b040268a2d1ecdd6b903762745b37
font_01_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 2528 bytes
SHA-256: fc4021e369c7333a3e2698b65512cd5ca33aa0a3949f6c925ad90d66ca89f0ce
font_02_sfnt_off000102bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 11404 bytes
SHA-256: 76bc542abd6c8238b10f25648cf7931fe0ff22d397ab398a9815329f5d78c6b5
font_03_sfnt_off00012a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 16264 bytes
SHA-256: b8ba11757fa9fd77ca8206fc1c3cf53a19ab31684ae2b25bd7e0ec4801e6c90b

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