Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e51d37809eabbe5…

MALICIOUS

PDF

74.7 KB Created: 2021-03-14 10:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 500d0bdf36f0bab762eb3a5220827ec3 SHA-1: f139049bfadd840adc9c057be2091cabefa29c6b SHA-256: 6e51d37809eabbe5c456b61f2f9bef33c4de6cdec5aef1563c30c9f897950bd8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation hosting, likely to distribute malware or conduct phishing. The presence of embedded JavaScript, though not fully analyzed, suggests potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jumiwimov.ru/strik?utm_term=forged+in+fire+knives+as+seen+on+tv PDF link annotation
    • http://wofijolusiga.iblogger.org/a_n_c_songs.pdfIn PDF document text
    • http://itverys.space/tawimiwonekajefitape985oj.pdfIn PDF document text
    • https://xawawamofolapus.weebly.com/uploads/1/3/1/4/131436997/1442568.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/zuwemunarodod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481173/normal_604d368eac0ea.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/6921419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5fdc6c7bc2538.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373782/normal_6007465fb1f93.pdfIn PDF document text
    • http://vinnipoh.fun/manosonoaocw0.pdfIn PDF document text
    • http://vusejulene.iblogger.org/legugabujeveropigitav.pdfIn PDF document text
    • http://usesucre.pro/677382174410xlts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_8305a941ecf14f19a6d8b3d4c5b2a510.pdf?index=trueIn PDF document text
    • http://gawekavadave.epizy.com/html5_responsive_one_page_templates_free.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_e54c131efd2547ebb3333bde744b4a18.pdf?index=trueIn PDF document text
    • http://jugebifa.epizy.com/36851268891.pdfIn PDF document text
    • http://vajapojaperusu.myartsonline.com/9857433212.pdfIn PDF document text
    • http://viwuwijagabote.myartsonline.com/mejoxinanobanimoloje.pdfIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_45f334dbe4c045d5b450acbe94d8d8e0.pdf?index=trueIn PDF document text
    • http://bedafenewax.rf.gd/97362003959.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_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 5124 bytes
SHA-256: 4f8b0a2b048d097dac126e18d0805ec1bbb7c805c1c463e5d161f6074b38b5dd
font_01_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 10616 bytes
SHA-256: 1ee6143f092583742d2f9b032d16e5382bd567b80e88c2bfd36cfafa45e7e3ef

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