Malicious PDF — malware analysis report

Static analysis result for SHA-256 c740f21fa86abc54…

MALICIOUS

PDF

82.1 KB Created: 2021-04-28 05:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 041cf78140ddd2c53af58ae2a3a827ab SHA-1: 8e94caba2616657922c9e411692b4c30e6820523 SHA-256: c740f21fa86abc5430e9f595efbf72c38a5c379c5842f3337fd814b10f27f373
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or redirectors, indicating a link farm designed to obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector, and ClamAV detected the file as a phishing trojan. The document body, though heavily obfuscated, contains text related to movie downloads, suggesting a lure to attract clicks.

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://yafferge.ru/strik?utm_term=doll+house+full+movie+in+hindi+download In PDF document text
    • http://nitapida.mywebcommunity.org/o_come_to_the_altar_bpm.pdfIn PDF document text
    • http://wivupivipewezap.mygamesonline.org/article_a_and_an_worksheets_for_grade_1.pdfIn PDF document text
    • http://melukutirigap.22web.org/12880185171.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/bootstrap_4_sass_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guseboses.atwebpages.com/digital_marketing_capstone_project.pdfIn PDF document text
    • http://wunorewotiv.epizy.com/5482645282.pdfIn PDF document text
    • http://xivivafin.rf.gd/ronotovemoru.pdfIn PDF document text
    • http://tixiwepire.epizy.com/honda_moped_service_near_me.pdfIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_ca5a6adc05a4424aa2582f18201e6e14.pdf?index=trueIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_058bea24c615484bb9f6c40327d3531d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c30f092-3a07-4d1f-ad9b-c813cd18eb52/bissell_big_green_carpet_cleaning_machine_86t3_vs_rug_doctor.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_00c80bdd06be40c4ab68681fb5d849f9.pdf?index=trueIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_3c5fb04940db457d95351325ef1b5ae4.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_f92f7e8c2bb64165a979e22e700e9861.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_43c3f5ddaa7c48ed829afec078825f7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ec6773-d060-4a4c-8782-fb8b142c29db/kekuzevivuwijiz.pdfIn PDF document text
    • http://gojeduxodevesif.epizy.com/zonewefajiwilekofuxalom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e2e593-e6bd-42de-a0de-9f8447c66189/deretajowofobobon.pdfIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_b9623e29b9e8411e902f3bf40847c0be.pdf?index=trueIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_5092a04547374e55b4451ca13b4cd82a.pdf?index=trueIn PDF document text
    • https://d18305a7-0466-4694-8d11-add24106148e.filesusr.com/ugd/99b222_542a922711fa4c99928234211d723c56.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 5200 bytes
SHA-256: 585bad45b42f3aee5899b0a2539977b4b88fd124a8fec58ce2b1b4ed72ce6c98
font_01_sfnt_off000115e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E9 11040 bytes
SHA-256: 9f3275a2653bb817ea58e1c4c65cebb6ceef8205572ce1c28036630c607a7b46