Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e98bc20ebbaa179…

MALICIOUS

PDF

73.2 KB Created: 2021-01-06 13:16:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8ec405edee853552b1356a8c8bb42183 SHA-1: 3e887a200f421989d44947ed239aa6f69760b151 SHA-256: 4e98bc20ebbaa179f30e1a8231d17ee1564c6813c416d431d05392d4b10273c0
222 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a large number of external PDF links, suggesting a link farm for SEO manipulation. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a download button lure and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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
  • 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://traffking.ru/aws?utm_term=jpg+to+excel+small+pdf In PDF document text
    • https://ligapixoxos.weebly.com/uploads/1/3/4/3/134378271/gitebu.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/3203950.pdfIn PDF document text
    • https://jedufopev.weebly.com/uploads/1/3/4/4/134490540/921282.pdfIn PDF document text
    • https://xepebujusu.weebly.com/uploads/1/3/4/3/134319702/3772806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5fdbe1a003f8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ae0327-dcf4-407a-9b68-8baccdf3551b/15756756579.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/watch_thor_the_dark_world_online_solar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e00cabb-66cf-4bdb-87de-ba1083b1ece9/nutivoxerozanitaxawukoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a364978-a71a-46d2-be2d-0982fab6f3f1/how_many_perfect_lsat_scores_per_year.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e3fcc1-7fee-4202-b986-d0fc4bd412f1/82352739405.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/ribuz.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/phytophthora_parasitica.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_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 5436 bytes
SHA-256: f83b65ce3c5f3cca2d856335b13a588d60f0a1871c39a8a38d44b5b992dedbb9
font_01_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 10484 bytes
SHA-256: fcddcfd7191ddf7cb76dbcb3c50711eff793adeae6d43fdb6ca3776aa17696f7

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