Malicious PDF — malware analysis report

Static analysis result for SHA-256 847d6ef4aea371c1…

MALICIOUS

PDF

108.7 KB Created: 2021-05-19 23:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4348facb26a53befaec584fb105de972 SHA-1: 98ca3fdb69ae600490fbd1d3a5694b17df692ed9 SHA-256: 847d6ef4aea371c161bab59a8308b44b7f5c4da2ba5cd687e9b90407f560f154
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to SEO-optimized PDF documents, suggesting a link farm or content stuffing tactic. One primary URL, 'https://fokemale.ru/strik?utm_term=jugar+age+of+empires+2+online+gratis', is highlighted as a potential lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may instruct users to open a password-protected archive, a common method to bypass gateway security. While no scripts were directly extracted, the PDF structure and extensive link farm suggest an attempt to drive traffic or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://fokemale.ru/strik?utm_term=jugar+age+of+empires+2+online+gratis PDF link annotation
    • https://notuvovezed.weebly.com/uploads/1/3/1/3/131382721/pimuxobak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382421/normal_5fee3d053177a.pdfIn PDF document text
    • https://raxipufed.weebly.com/uploads/1/3/4/4/134474150/744eec8ad3530c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466679/normal_5fe84ee298e6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_6059b68cc117f.pdfIn PDF document text
    • https://mavilefisubagar.weebly.com/uploads/1/3/1/6/131606233/1579150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_6018e748daf3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412891/normal_60129c8c4c6bd.pdfIn PDF document text
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/72d63ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_603c5a2e24113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408587/normal_60672cf7abf75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371514/normal_605b13077e641.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb2df7c-72c3-465e-93c4-9e7d95544534/craftsman_16_inch_38cc_chainsaw_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/3020186149.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/61276310811.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/kisaxazuvida.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/what_is_youth_culture_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/xufunikifikorijepusegum.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/how_deep_can_garrett_ace_250_detector.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/el_ser_uno_vi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/894aaa76-adef-4693-a5a3-4998d06508b5/fender_mustang_i_v.2_modeling_guitar_amplifier.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/92451300585.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_off000166d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D1 5340 bytes
SHA-256: 64bc5600d0995d583aca1b092cf86a7d1eb6d10ca427e2c464384676d0be9714
font_01_sfnt_off000178f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178F0 13224 bytes
SHA-256: 6cd457fb15c07297dd224607daf1ac93f06174c40186713811d459d7d0367582

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