Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ecbd25918f205d…

MALICIOUS

PDF

67.5 KB Created: 2021-03-04 18:16:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c08c20656fd71281c85d5968a0bd3b0a SHA-1: ff9a8cc2ae2ef1c42a01614509fe8f56ea386ebb SHA-256: 49ecbd25918f205d0b95cf07735df09dd6f766c3285ee6aa6f01dd84bfef196d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gimoguvi.ru/strik?utm_term=how+to+fix+a+squeaky+maytag+neptune+dryer PDF link annotation
    • http://silkhfig.bid/where_can_i_watch_the_new_twilight_zone_for_free9kxoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xanovixewin/3JjfXzS/43013696206.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/h7iaHhe/hot_deals_electronics_customer_service_number.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/jiaWhft/van_leeuwen_vegan_ice_cream_ingredients.pdfIn PDF document text
    • https://cdn.sqhk.co/pegebatanuz/ZWoAIgi/rirasaramidoregitize.pdfIn PDF document text
    • http://bigchance.pw/alex_rider_tv_series_2020_release_dateu9dxi.pdfIn PDF document text
    • http://giveaway2020.info/65438785237q4v5l.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/jijfjd1/ultimate_fighting_street_fight_championship_full.pdfIn PDF document text
    • https://cdn.sqhk.co/toledexipez/iczhJhf/real_followers_for_instagram_free_app.pdfIn PDF document text
    • https://cdn.sqhk.co/gegatuzikat/THzif8I/hyrule_warriors_puzzle_pieces.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480580/normal_600e738150484.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/hJgfhdA/vanizezasipevir.pdfIn PDF document text
    • http://static-get.top/tataxuwekudadt31l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382639/normal_6013a85cb10cf.pdfIn PDF document text
    • https://cdn.sqhk.co/mesojofu/6hsgjSn/bugipik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500450/normal_5fc8b3a561ce8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412896/normal_5fe20ea72a435.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_afda338324d2454bbca3311ef8c779eb.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_72d52597296140c885b34265d9c533bd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB0 5740 bytes
SHA-256: 274eb1ffed65e5b591bcc94ad7b7e88db38a5a51160babeca91b2cd6f78a69cf
font_01_sfnt_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 9916 bytes
SHA-256: 12f6de3b2c5044e1603a7076bf0e9f95a517f4b2b144ebae14e7707dc129dde6

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