Malicious PDF — malware analysis report

Static analysis result for SHA-256 547a910dad1b4ced…

MALICIOUS

PDF

72.3 KB Created: 2021-01-11 15:27:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 68e674d97764bc279278a1d8a1bb9937 SHA-1: 7fbf8f93363ddf2f131aef1eded8efd34374852b SHA-256: 547a910dad1b4ced074d7205d6b925a089ab1b911d3cea7531880140c748402c
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure ('https://gettraff.ru/123?utm_term=prostitutes+in+gta+v'). The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of multiple links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gettraff.ru/123?utm_term=prostitutes+in+gta+v In PDF document text
    • https://cdn.sqhk.co/zupodejadofe/Uxwtcge/download_zoocraft_animal_family_mod_apk_unlimited_money.pdfIn PDF document text
    • https://fineruliji.weebly.com/uploads/1/3/4/3/134313455/sokif.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/napamafunow.pdfIn PDF document text
    • https://natevotid.weebly.com/uploads/1/3/4/7/134773148/vapogeduvigevolamif.pdfIn PDF document text
    • https://milavigik.weebly.com/uploads/1/3/2/8/132815866/tizew.pdfIn PDF document text
    • https://welavofewefose.weebly.com/uploads/1/3/0/8/130813025/vefewapavodudulipek.pdfIn PDF document text
    • https://bapixive.weebly.com/uploads/1/3/4/3/134393773/51c5ce.pdfIn PDF document text
    • https://zakiguranul.weebly.com/uploads/1/3/4/4/134480990/vuxotegaburobatiw.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/5e05799.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/liwara/blackberry_z10_software_update_10._3._2.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/bournside_sixth_form_term_dates.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/free_hd_wallpapers_for_android_phone.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_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 4880 bytes
SHA-256: 9998c8864e0d7287efe8a85658a3deb7c045f094de098c5e26ad8d52b4e82dee
font_01_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 11036 bytes
SHA-256: 62fa42fffad9250abdde686fee8d092400a54391a2886e069e4ecdd5af380545

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