Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce8b40f5b623604…

MALICIOUS

PDF

77.1 KB Created: 2021-03-14 07:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1f7a5eac34f9e58420bbdcd89caab906 SHA-1: d905e7d221add12f8e909c0730fd94e4142051fb SHA-256: bce8b40f5b623604adfc192920f68675c6645f0fd8261f3b15a07554a3416cd9
136 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users to malicious content. The primary redirector URL, 'https://zajinet.ru/strik?utm_term=couture+sewing+techniques+claire+shaeffer', is identified as a high-risk SEO redirector, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the structure and heuristics strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://zajinet.ru/strik?utm_term=couture+sewing+techniques+claire+shaeffer PDF link annotation
    • https://rogebupapopax.weebly.com/uploads/1/3/0/7/130739826/wowejekimute.pdfIn PDF document text
    • http://tugokutuli.scienceontheweb.net/john_deere_l120_mower_deck_parts_diagram.pdfIn PDF document text
    • https://wazevavipedad.weebly.com/uploads/1/3/4/4/134484144/vezol.pdfIn PDF document text
    • https://xiwirananuwiro.weebly.com/uploads/1/3/1/0/131070481/xewajejovijojug-vetijusagis-kuzigoludu-vogera.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/hifjcjM/tuberculosis_definition_in_spanish.pdfIn PDF document text
    • https://netexebi.weebly.com/uploads/1/3/0/8/130815192/141049.pdfIn PDF document text
    • http://silujokiz.mypressonline.com/10_class_biology_text_book.pdfIn PDF document text
    • https://cdn.sqhk.co/kofelejezem/8BMYjgg/78409186043.pdfIn PDF document text
    • https://cdn.sqhk.co/sapasimemo/ib3jejh/bubble_tea_tapioca_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/eLsjd2l/dikenagogele.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/pCjijic/ninja_dragon_game_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/rubewadavofubege.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/codycross_answers_group_20_puzzle_2.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_da8f993acd484a81918afffdc00f9c40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/university_acceptance_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/vusapijonuj.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/handbook_of_virtue_ethics_in_business_and_management.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/cloudformation_template_conditions.pdfIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_bee1bad4762549859936da44c25e99ec.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 5264 bytes
SHA-256: ad821813a1f029b3cbf28e68dd75a89d3342b5802f94b37224b407f3d48232c0
font_01_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 10644 bytes
SHA-256: cb5ac3a0cc1809e481a967e8d8109aad5d748efdc66f8222e63957deb4f8b190
font_02_sfnt_off000118f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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