Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9971ab7d6c4d1f2…

MALICIOUS

PDF

73.5 KB Created: 2021-02-13 05:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 79773f3d4a640c02efee0813eb6b93df SHA-1: 938622e8d9c8be940217dc42fb3cd83555f1e816 SHA-256: f9971ab7d6c4d1f25cc46ded4ec9273f2c032262f7521ddbdc967acc51cb6e16
146 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a callback lure heuristic points towards a phishing or scam attempt. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/123?utm_term=dragon+hills+2+download PDF link annotation
    • http://kimagibasip.22web.org/63769674680.pdfIn PDF document text
    • https://pasifoberili.weebly.com/uploads/1/3/4/8/134881239/wowagesimetadasa.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/6fb8c.pdfIn PDF document text
    • http://com-signto2.xyz/app_video_cho_iphonefkhei.pdfIn PDF document text
    • https://beburasitowetu.weebly.com/uploads/1/3/0/9/130969608/4198289.pdfIn PDF document text
    • https://nitesefoxon.weebly.com/uploads/1/3/1/4/131453907/runulesiwal.pdfIn PDF document text
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/711899144f4caf6.pdfIn PDF document text
    • http://vipodesin.22web.org/beagle_theme_song.pdfIn PDF document text
    • https://puxezemugip.weebly.com/uploads/1/3/4/3/134311794/4354908.pdfIn PDF document text
    • https://tilifopufobi.weebly.com/uploads/1/3/6/0/136049844/37ea2.pdfIn PDF document text
    • https://xamatetafuxu.weebly.com/uploads/1/3/1/6/131606968/babufux_dadepovopubise_xawakovam_bawinuwinetoje.pdfIn PDF document text
    • https://vesumuzuvof.weebly.com/uploads/1/3/4/6/134685641/tibelokodimixow-patinoxore-xagol.pdfIn PDF document text
    • https://jebasiju.weebly.com/uploads/1/3/1/3/131381450/xabisurutasaf_fiporabasurowa.pdfIn PDF document text
    • http://openplafond.xyz/hindustan_ki_kasam_1973_movie_free9e9mv.pdfIn PDF document text
    • http://chelamela.org/84480961408ed8m.pdfIn PDF document text
    • https://siwuluwavati.weebly.com/uploads/1/3/4/7/134756127/752944b847015fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://gojaxuga.epizy.com/auditor_general_s_report_2016_series_2.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC233 5308 bytes
SHA-256: 9ec255cc05460e62dcdf3fef7c720e1ec73c06ad3e8c1505fde876944943dfdb
font_01_sfnt_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 7640 bytes
SHA-256: 77c9324d3773f3cb4585bffeee91ea6786cd55868dfb8c453a14d835d477e233
font_02_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 14848 bytes
SHA-256: 06c6285fc25947c96bd64af388b65df4b56e74d4188d415a939aa9a4b4a6d08b

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