Malicious PDF — malware analysis report

Static analysis result for SHA-256 779a7036b67ae659…

MALICIOUS

PDF

81.9 KB Created: 2021-03-31 14:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d9d1d59e77fbe32de9e16f3b4ecd0f8 SHA-1: 268e523caa2920b72cac6571918d4c7ca8bc6006 SHA-256: 779a7036b67ae659b6b909df88f5d10b7b8509630f19339db7b7e0f00e3480b3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=honda+civic+repair+manual+years+1996+to+2000
    • http://nukicew.xyz/marble_machine_sheet_musicx6alr.pdf
    • http://yoga-fitness.space/74632052682koftn.pdf
    • http://yourcy.com/xofabudololorajunijapuf6nto7.pdf
    • http://soldonlittleton.com/345460785508ex6c.pdf
    • http://ihsteam.ru/how_to_bypass_lid_switch_on_kenmore_washer_model_11056flo.pdf
    • http://iqecoportal.ru/871478945159vs7c.pdf
    • http://francobusiness.com/four_corners_2_workbook_answer_keyk69ci.pdf
    • http://help-igcopyright.xyz/virupelesovoza4kgyj.pdf
    • http://prequester.online/96973835971ukysl.pdf
    • http://khareedforosh.com/xuximuraluxujerqg9r1.pdf
    • http://dhl-order.info/how_to_find_the_area_and_perimeter_of_compound_shapeswft16.pdf
    • http://forexgeeks.net/paxetorojuk1knz.pdf
    • http://cocobeautybar.ca/best_free_quit_smoking_app_uk7sgy0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ronatiduzoxij/cricut_expression_2_price.pdf
    • https://s3.amazonaws.com/rogugagatuf/31943951999.pdf
    • https://s3.amazonaws.com/vavale/46609796053.pdf
    • https://s3.amazonaws.com/gewisetug/dhak_dhak_karne_laga_song.pdf
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_604c968b22d445a897446d52cf92b139.pdf?index=true
    • https://s3.amazonaws.com/jinabom/10061315076.pdf
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_d7b4347e72ee46d982d5c0aa6f0b30aa.pdf?index=true
    • https://s3.amazonaws.com/ninazarila/91967437389.pdf
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_e61d5b65cdd34f118cf59466ed4dca49.pdf?index=true
    • https://s3.amazonaws.com/lowebemuwojiso/i-102_filing_fee.pdf
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_4fb821d69f314e0ea5bd7c464ce10f3d.pdf?index=true
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_580bb4b4a22f403bbb9aa02445bfd32c.pdf?index=true
    • https://s3.amazonaws.com/fatikonavori/wereginigukimasu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f776.bin
67e0d0a7e67c2beb72223928ebbd38a84aaff20be7b330e7dbd339eed289f71b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 5976 bytes
font_01_sfnt_off00010bb8.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 1800 bytes
font_02_sfnt_off00011445.bin
e671ed51fa95338d3a9ec4d5d1e364887aa741905b7ac219b1bc2eb612afe3a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 10880 bytes

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