Malicious PDF — malware analysis report

Static analysis result for SHA-256 565922894ed1e4cd…

MALICIOUS

PDF

125.4 KB Created: 2021-03-18 20:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b957f78314a31459d3713648f987186e SHA-1: 17547267dfa6b2772befd6b3e5e9704286f83321 SHA-256: 565922894ed1e4cd7048659331240289e4cb9f4728e9ab6eb6bf1fef9b5acc22
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=neurolinguistisches+programmieren+b%25C3%25BCcher
    • http://tulutita.sportsontheweb.net/speakeasy_new_york_lower_east_side.pdf
    • http://rumafelaneli.mygamesonline.org/the_screwtape_letters_christian_review.pdf
    • http://bavimobuxadu.medianewsonline.com/27113299983.pdf
    • http://sebevifa.getenjoyment.net/sigaborukutudepemexup.pdf
    • http://mozaduz.mygamesonline.org/97955401177.pdf
    • http://dosaxixapaxa.medianewsonline.com/10363298119.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vavabi/time_bomb_timer.pdf
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_b03f1e27b020400fa4c69093fbb6b0ad.pdf?index=true
    • https://s3.amazonaws.com/vutame/hindu_calendar_2017_app.pdf
    • https://s3.amazonaws.com/kimone/planting_and_harvesting_seasons.pdf
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_7232efc30c224dcab698fe3daf8db564.pdf?index=true
    • https://s3.amazonaws.com/jonora/best_stock_books_to_read_for_beginners.pdf
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_9a5b910e10e94726ac0b21433beb3d8b.pdf?index=true
    • http://rabatelekovufar.myartsonline.com/85271578826.pdf
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_6eca9afecfcc4e8ca6b5279d48a3a695.pdf?index=true
    • https://s3.amazonaws.com/zozuxukoxo/1708791860.pdf
    • https://s3.amazonaws.com/zubuwujoxom/43688511759.pdf
    • https://s3.amazonaws.com/xazarujokemus/shopee_apk_terbaru.pdf
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_b081f98e5d2749f39080ca9dcc23a4af.pdf?index=true
    • https://s3.amazonaws.com/takebemanijewok/21569947206.pdf
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_504751cd201543678cbdf223f5e7e605.pdf?index=true
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_126308f204234deba4c26ab3aff65237.pdf?index=true
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_11a8f31d3c334ac6a980a0e1ce6bc2cf.pdf?index=true
    • https://s3.amazonaws.com/buponuwebi/wamidifot.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_off00019acf.bin
40cc8387c7946c5ce20bc97bff3b3516d7c58aaabbbb41ff7575d1b63ca81d88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19ACF 5460 bytes
font_01_sfnt_off0001ad04.bin
4fb09e2c58b241d9417b34e334dc88fb767c9f3a8e5277f25df73b735ae04cb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD04 12808 bytes
font_02_sfnt_off0001d6b8.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6B8 4324 bytes

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