Malicious PDF — malware analysis report

Static analysis result for SHA-256 580266213f252ab8…

MALICIOUS

PDF

81.4 KB Created: 2021-04-25 11:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 544cdd5919b9920e6d75ce2f637a9875 SHA-1: 7d480bd841e768873ff91f61e042daf20da16a22 SHA-256: 580266213f252ab8847ab69eaebd94c8a041e7a771745fe1061beac6dd923339
244 Risk Score

Malware Insights

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

This PDF document contains numerous links, many pointing to disposable hosting and redirector infrastructure, designed to lead users to malicious content. The primary malicious URL identified is https://dafemum.ru/strik, which is flagged as a known malicious redirector. The document's content, disguised as a guide for removing a fire alarm battery, serves as a lure to encourage clicks on these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=how+to+remove+battery+from+kidde+fire+alarm In PDF document text
    • https://dedaxasufebix.weebly.com/uploads/1/3/0/7/130775271/siroguvawes.pdfIn PDF document text
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/9253442.pdfIn PDF document text
    • http://totipuzuforaz.mywebcommunity.org/vodadavoxavikufexo.pdfIn PDF document text
    • https://cdn.sqhk.co/tilekixu/Bfijggf/maridhas_answers_website.pdfIn PDF document text
    • http://gibelineg.sportsontheweb.net/negapalifobajidexulif.pdfIn PDF document text
    • https://jejenovo.weebly.com/uploads/1/3/1/4/131454593/2aa8d24e39d8016.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/98221420344.pdfIn PDF document text
    • http://merexazumebenag.medianewsonline.com/bariwederitomorukemed.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwasusul/cXdjev8/86177480192.pdfIn PDF document text
    • http://vasizazesunof.medianewsonline.com/advance_auto_parts_application.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_d5f6d4c3bc3340d597b81f1baaf47b5e.pdf?index=trueIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_11d41ee5bf2140468e80c4edc125df6d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/081d3067-5619-4805-945e-127a568261ab/netisefevumolesiwi.pdfIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_02ad333114ed49e9b1cb65df6a1f353c.pdf?index=trueIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_c915856d216744e59c8657ec06cb86b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ximupuv/turitosodokun.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/html_codes_and_their_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcfbfa61-ee5e-4e91-9984-6e368d5fa020/loxedabixoxifemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e08948-7517-40a8-8688-8b91010b4d3a/kwikset_powerbolt_2_app.pdfIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_511a7b59f501498ab8f8781567e7e8a6.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 4976 bytes
SHA-256: 5eece48b7567c0ffca774f07ae1cabe5d51988980b9b78ebcf33eb05c5c6192c
font_01_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 11112 bytes
SHA-256: 7d043a0c64d5a3cdf093b637d3c9d36b0ad56d7dcaedf42c845c7bb6237b7067
font_02_sfnt_off000129f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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