Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cc831253ad9852…

MALICIOUS

PDF

77.1 KB Created: 2021-06-12 18:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 672a9bc5997ae8f205fd49d61798f810 SHA-1: e0b422bb22b0310fb2de9ec8d8ac2f5a02a342ef SHA-256: b9cc831253ad9852fdaa8e3b67312d855cecf4b9a222ed189edee997bfa6d990
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a high-confidence heuristic identifying it as a PDF SEO link farm. One prominent URL, 'https://pixomot.ru/pbw?utm_term=the+vampire+diaries+with+subtitles+in+english+online', is flagged as a redirector and likely leads to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution.

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.
  • 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://pixomot.ru/pbw?utm_term=the+vampire+diaries+with+subtitles+in+english+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458412/normal_605975b18f17e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445129/normal_5fd5f392e6585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_6025311fd0e4c.pdfIn PDF document text
    • https://lonoripub.weebly.com/uploads/1/3/5/3/135319728/busuloda-vinegefegez-mudutopuxagi.pdfIn PDF document text
    • https://feropozu.weebly.com/uploads/1/3/1/4/131454035/1303525.pdfIn PDF document text
    • https://xisiwazebisa.weebly.com/uploads/1/3/4/7/134758569/kixubujofat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_60447411b59f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379848/normal_5fff39047a3d5.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/3f1706ef-3b0c-487b-a634-42f43cf52832/ps_vita_memory_card_adapter_where_to_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e90f68-6387-4c12-a1ed-86b796efe25e/what_is_star_delta_starter_control_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa9c0ff-6fb2-4256-8187-242fb43043ae/15180089947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3481081b-9a88-4856-952a-2dc935072800/8116929629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af9bc8f-ee8c-4c0a-b6e5-8e55f3fdacb7/17085183263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa1370d-4004-4093-9082-c391644c0aff/programacion_del_plc_siemens_s7-1200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3464b8c6-1184-4e54-baa7-1770ba40fafa/sexexiturajan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6e9a2b-2456-459f-b245-efaac18f77c4/prentice_hall_gold_algebra_1_answer_key_form_g_chapter_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b49a527-081f-417a-a4ee-67eab8e15b44/how_to_activate_expired_sim_card_digi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5488575d-dd18-45a1-a497-45732d01f226/fojiposodefamevojeregale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f17721e-99df-4a05-b300-d53dc72b911a/fallout_4_mods_ps4_not_working.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_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 5616 bytes
SHA-256: 2bcad953ee415319be3f649107fff258b94031b8d6d91200f482426e44ed8cc3
font_01_sfnt_off000101a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 10364 bytes
SHA-256: cac87d2e83ad1b46dbc45b1c68cc3a8844035f341e4000bcb685160b447cdf63