Malicious PDF — malware analysis report

Static analysis result for SHA-256 b796367635117026…

MALICIOUS

PDF

68.4 KB Created: 2021-02-06 16:26:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 84e45639cfa3777030ceb1cc1008a6bd SHA-1: e1b4a6d531190d0200a6a8ac51b8fa92f5eb9f00 SHA-256: b79636763511702695d171f9adf2aba3d6a97ac32bdaf65e88f36db8cf8365ba
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which are hosted on disposable domains and point to redirector infrastructure. This pattern is indicative of SEO spam or a phishing campaign aiming to drive traffic to malicious sites. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

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
  • 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 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.
  • 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://yafferge.ru/wb?keyword=decimal%20place%20value%20worksheet%205th%20grade In PDF document text
    • http://gikadoketu.iblogger.org/bisection_method_theory.pdfIn PDF document text
    • https://cdn.sqhk.co/kagixepo/icdid6S/xukodaxukaxos.pdfIn PDF document text
    • http://pirawamajakemiv.22web.org/fmea_template_for_software.pdfIn PDF document text
    • http://1xbet-registrat.site/2541784570t82xu.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/biihbhh/gothic_murder_adventure_that_changes_destiny_switch.pdfIn PDF document text
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/67eff13bdbb.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/Xgcg1gi/mario_and_luigi_running_mario_maker_2.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/jdqWEOJ/unlock_transfer_market_fifa_20_companion_app.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/ZXhgIig/4_pics_1_word_6_letters_level_651.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jawedujap.rf.gd/navubifugolugiwezu.pdfIn PDF document text
    • http://podugidak.epizy.com/protoxyde_d_azote_formule.pdfIn PDF document text
    • http://kizarepopudoso.epizy.com/action_verbs_worksheets_for_grade_3.pdfIn PDF document text
    • http://koxowasone.epizy.com/behavioral_leadership_questions_and_answers.pdfIn PDF document text
    • http://pumatelikowe.epizy.com/nfl_week_4_injury_report.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_off0000cd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0F 5828 bytes
SHA-256: 450758be85fa9a458b0cb907b967210d96d07bb0b2fa69d3d3da7bd0007d7393
font_01_sfnt_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 10476 bytes
SHA-256: 7775053785f2751491121685202279f4dff37e2ca601a871ca7b1bd70774fc5e

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