Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d8b98d2b4282f2…

MALICIOUS

PDF

85.4 KB Created: 2021-02-05 23:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: aecd7ce84babf70808a74d5c840ca246 SHA-1: cddc2b71c7d2a292f1939599161f4e8326dda5df SHA-256: 71d8b98d2b4282f2af8d7b4069b947065bcd4b028f4cd310ee52dfb76e696583
184 Risk Score

Malware Insights

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

The PDF contains embedded links to malicious redirector infrastructure, specifically `https://crophysi.ru/wb?keyword=la%20times%20monday%20crossword%20answers`. This indicates a phishing attempt disguised as a crossword answer key. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

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
  • 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 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.
  • 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/wb?keyword=la%20times%20monday%20crossword%20answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4413243/normal_5fed8fbcb1e9e.pdfIn PDF document text
    • http://guworumitikizu.iblogger.org/zedakixa.pdfIn PDF document text
    • http://xajaweronasuxo.22web.org/binomische_formeln_erkennen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425916/normal_5fcb2d2e4e4da.pdfIn PDF document text
    • http://itslm.fun/125755089927i6el.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427509/normal_5ff9a80c58333.pdfIn PDF document text
    • http://bu-markett.com/tuzutatodanaxoxon3wjmu.pdfIn PDF document text
    • https://cdn.sqhk.co/kisunika/hsdijig/17740358744.pdfIn PDF document text
    • http://wamepiguvoj.iblogger.org/offer_letter_template_real_estate.pdfIn PDF document text
    • http://navelina.iblogger.org/loledejivifafununegi.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/34609828763dwf3r.pdfIn PDF document text
    • http://mavisuvegepufi.iblogger.org/numbers_in_english_esl_worksheet.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
    • https://s3.amazonaws.com/gapivegek/angamaly_diaries_theeyame_dj_song.pdfIn PDF document text
    • http://jibipadesubamom.epizy.com/assistir_globo_reporter_ansiedade.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/vba_excel.pdfIn PDF document text
    • http://zopefunexot.epizy.com/vekabidujimus.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_off000103d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 5188 bytes
SHA-256: 58bd3712aeccf034e2cdc4d35c4563deb774eb5236dba2d066d2400587565eda
font_01_sfnt_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 6148 bytes
SHA-256: 149738eb3e1d0bfb4a5732e89a115965e6f0cf3fc4971c694d3ce3619176544d
font_02_sfnt_off0001254d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254D 10172 bytes
SHA-256: effcece7db000520a62d021a00c6f591813b37a811bc57ea6402db088894ed81

Open this report in the interactive analyzer, or submit your own file for analysis.