Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fa86248ceb0d9c…

MALICIOUS

PDF

76.8 KB Created: 2021-02-25 12:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 38b332a688f9bb2593159887691d1f3e SHA-1: d6c84dbfb1be90e9a02873de3954908e812269b3 SHA-256: 22fa86248ceb0d9c15d78dfa61672c751828a8590d1e5a9d6c8ce044e5fb2c4d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and heuristics suggest the primary goal is to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/strik?utm_term=gardner+multiple+intelligences+test+elementary In PDF document text
    • http://naliputa.mywebcommunity.org/why_is_arbonne_not_a_pyramid_scheme.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/metilowafe.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/QKyAgfe/natizituxok.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/fHgidST/bloodsport_remake_2019.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/65554365044.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/dZgjr4L/naxovin.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/dirt_devil_featherlite_bagless_upright_vacuum_belt_size.pdfIn PDF document text
    • https://cdn.sqhk.co/ledumixifer/ihjfjay/29896856506.pdfIn PDF document text
    • https://lalojitewimagix.weebly.com/uploads/1/3/5/3/135304200/wofumet.pdfIn PDF document text
    • https://bovuvodesibos.weebly.com/uploads/1/3/4/3/134377535/c15b584cb.pdfIn PDF document text
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/a7cd59a56f00.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/b2xOjhK/davugarisizo.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/samugu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wixanarer/yankee_doodle_boy_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/trueblue_annual_report.pdfIn PDF document text
    • http://vunonam.atwebpages.com/49065829182.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/53263802144.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/46249447080.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/rmlau_scheme_2019.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_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 5528 bytes
SHA-256: 0c0d0f08ba4613bf057a3a5d12418d8061e6a18d295eedd2349293a07cbdf6e0
font_01_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 10144 bytes
SHA-256: 29b3c7c55b6dbe70d7b266186580784158738fd44e3b77bdd2fd6335abc00fe4

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