Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd561012df95875d…

MALICIOUS

PDF

78.2 KB Created: 2021-02-18 08:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b77224455eaf39187f18bb7a008bf7b6 SHA-1: 0505867d487729f0723e6cb7cce2c4344fed9990 SHA-256: cd561012df95875d85d11858bced1fbe52920c901e229461586e1cdf2b097722
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document functions as a link farm, containing numerous embedded URLs that redirect to external sites. The primary URL, 'https://yafferge.ru/wix?keyword=showbox+apk+ad+free+download', suggests a lure for potentially unwanted software. The document's structure and the high number of links to disposable hosting services indicate a malicious intent to distribute malware or lead users to phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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/wix?keyword=showbox+apk+ad+free+download In PDF document text
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/jesogina-ginepo-zelurisuwifemod.pdfIn PDF document text
    • https://bugomalaked.weebly.com/uploads/1/3/5/3/135324661/bofowitigajudas-dijejejikojin.pdfIn PDF document text
    • https://sipelebe.weebly.com/uploads/1/3/4/3/134312525/kaliret.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/bidxibP/how_to_get_more_gems_on_episode_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/dosazuleg/iihaBhf/dixamiwur.pdfIn PDF document text
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/5e47c638.pdfIn PDF document text
    • https://gitosupogule.weebly.com/uploads/1/3/2/7/132741155/voxegolirew_fokozinek.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/ibTRBjd/bebojor.pdfIn PDF document text
    • https://fuxopejebema.weebly.com/uploads/1/3/4/0/134018858/9525944.pdfIn PDF document text
    • https://zovakilezogavi.weebly.com/uploads/1/3/1/1/131163957/kufasotulemuden.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/jiparipivagu-dokezewu-sujivonowawujuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://setavafajo.epizy.com/anemia_microcitica_pediatria.pdfIn PDF document text
    • http://kunijudodo.rf.gd/16096411428.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/create_template_powerpoint_2013.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 5416 bytes
SHA-256: 112dd2f5bf9152158dc4aeee858f6200ae7bba754dad4b59651125ebd1aaf454
font_01_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 10080 bytes
SHA-256: 7d3cfc3c2ee2b6a2e54efea47c11042640b617646e91d415d9ccba352cf47c20
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e

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