Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3326777a73e6362…

MALICIOUS

PDF

71.9 KB Created: 2021-02-22 23:14:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c3e77c2383f6e0c793e3b1f24603044d SHA-1: b0a042ccaf43fcb088250af7515414dacb4ff431 SHA-256: a3326777a73e63624205443dc8a6f1bd025bd99a62daff545421aa776c8e9777
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://crophysi.ru/wix?keyword=magicjack+google+voice PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403260/normal_60037dabc8369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_601b36a255ed1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416919/normal_60054c6679aa3.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/VhogcBq/mantel_clock_repair_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_60304c0ade31c.pdfIn PDF document text
    • http://rotixumuzu.22web.org/56590868523.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447497/normal_5febdacf0d68f.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/hhhekia/josudejudegolet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_600e7f2be30b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382186/normal_600d50a18a8ae.pdfIn PDF document text
    • http://loxapul.iblogger.org/83711807743.pdfIn PDF document text
    • http://bapozuwemixad.22web.org/65924878264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_60112add7c6d1.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/qpU9kie/bike_racing_3d_java_game_download.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/devuxuzejozam/kelly_s_theory_of_causal_attribution.pdfIn PDF document text
    • http://vatasinunevuto.epizy.com/checkbook_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/impossible_quiz_2_answers_46.pdfIn PDF document text
    • http://dezezefisimel.rf.gd/pixark_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/96008747043.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_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 4896 bytes
SHA-256: ca2b40a9613db29d5e55d91bc31c95b404ba3f9164bff51ad274f85db8cad9b2
font_01_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 10220 bytes
SHA-256: 7f2c0161fcb82fd29556cc265c3d85062e5c17722a4276667adaf7c1cefbfe77