Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e99ce8aff2b71f9…

MALICIOUS

PDF

71.2 KB Created: 2021-04-06 13:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d2e950293caf66c981c97480045abdb9 SHA-1: d919f48844bb4c9fab010254a5e7742b76c34954 SHA-256: 0e99ce8aff2b71f9073b2db1abfc54dbe8a9a5c75a95870791a7bab39b6ac573
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links to various domains, many of which are disposable. The ML classifier and ClamAV also strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The embedded URLs and the structure suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nipisod.ru/aws?utm_term=how+fast+does+a+9.9+evinrude+go PDF link annotation
    • https://buvaranugabenu.weebly.com/uploads/1/3/0/8/130873820/26d1e16f85ccb30.pdfIn PDF document text
    • http://warokibujiz.getenjoyment.net/arabesque_piano_sheet_music.pdfIn PDF document text
    • https://momaramurelu.weebly.com/uploads/1/3/4/3/134309976/zufoxon.pdfIn PDF document text
    • https://sigalositas.weebly.com/uploads/1/3/4/6/134618276/fb853bd828188.pdfIn PDF document text
    • https://fibarivinudew.weebly.com/uploads/1/3/5/3/135387866/beviz_xugufoxibakiluz_towomanizo_mumuxaru.pdfIn PDF document text
    • http://ninijefaligogi.mygamesonline.org/green_day_boulevard_of_broken_dreams_tab.pdfIn PDF document text
    • http://voztrans.ru/84376125848m05kd.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/78173181729.pdfIn PDF document text
    • https://zutijuxugovoxi.weebly.com/uploads/1/3/4/6/134684331/e492e44.pdfIn PDF document text
    • https://leresidatebij.weebly.com/uploads/1/3/0/7/130776374/wizivixalozala.pdfIn PDF document text
    • http://atelier-spb.com/night_shift_jobs_part_time_singaporeta2c7.pdfIn PDF document text
    • https://tasitonedilegu.weebly.com/uploads/1/3/5/3/135301248/teriwexulaza-bovefosamafas-lokawofud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://levamux.rf.gd/pukofopa.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/52630256039.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/kikaxapolabebolugejowa.pdfIn PDF document text
    • http://sonapap.rf.gd/3336184118.pdfIn PDF document text
    • http://zavoxivilog.epizy.com/67916729768.pdfIn PDF document text
    • http://fakeduzit.rf.gd/69580097487.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/31740882905.pdfIn PDF document text
    • http://borovob.epizy.com/wosezifivudeve.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_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 5344 bytes
SHA-256: ab6ade2b7376343c71c7e37228af17e39e21c69a0aee567b052c4f5fe8a01a67
font_01_sfnt_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 10700 bytes
SHA-256: 911ee7e6e8ae8f0b8e3b3e0bfc884b31ea2ed001cf93d9890bb60008cbe6da35

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