Malicious PDF — malware analysis report

Static analysis result for SHA-256 7902abc244cdc6fb…

MALICIOUS

PDF

72.8 KB Created: 2021-02-10 17:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ac50c7986f002558c0d4403d40794df2 SHA-1: 104ddaa9afdd9dc63918d9be066a60c22a633932 SHA-256: 7902abc244cdc6fbb8b09fa1d58aa39b77e5b92ac9cc7c2b84f59d39243c11f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://druttle.ru/123?utm_term=vancouver+cost+of+living+vs+atlanta PDF link annotation
    • https://cdn.sqhk.co/ragonujip/gddijhb/shareit_app_free_download_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413474/normal_5feead2a2a567.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497078/normal_5fec2431383c3.pdfIn PDF document text
    • https://kijidagidopijub.weebly.com/uploads/1/3/0/7/130776406/2e3cd90260ecda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fd6239ab055e.pdfIn PDF document text
    • https://jiromozuno.weebly.com/uploads/1/3/5/3/135387519/piwuwovidifekim-dufuvojujod-lemutisej.pdfIn PDF document text
    • http://afracheat9.xyz/bemorutenenanaz895ta.pdfIn PDF document text
    • http://gelchlen.fun/11275122222o5o1p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_601ed5c60e5db.pdfIn PDF document text
    • http://pmaider.com/wejekurodojezewutogmpku4.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/izRhf0e/carx_drift_racing_2_best_tier_4_car.pdfIn PDF document text
    • http://1xbet-regi.site/study_guide_for_nclex_rn_20192vnb5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebeminozari.epizy.com/how_to_treat_water_for_coliform_bacteria.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/banamebabipenu.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/34822943430.pdfIn PDF document text
    • http://rodijegowufewap.epizy.com/78938173377.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/35595141342.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_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 5076 bytes
SHA-256: db718628161110f41b74840e92f52c2b008b25d76ae6e8e20c0a6d40df5ead4f
font_01_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 11428 bytes
SHA-256: de057ee022547b5d37325db9a67d3f45444e55e42e7510d57f1824a42ed18b99