Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f7c7871374e616…

MALICIOUS

PDF

81.0 KB Created: 2021-03-25 14:12:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ad6b7688eabfba35a69caafcb5c02c33 SHA-1: db17da44cabf2a1af7edd3e5d8a3662a22d9b968 SHA-256: 88f7c7871374e61696b32a2e4744de1c227a70e9ced5ddeaca83d0928f6bd1b6
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic flagging it as an SEO link farm and a high-confidence ML classifier identifying it as malicious. The primary URL, 'https://dugedepap.ru/wix?keyword=alameda+county+map+evacuation', appears to be an SEO redirector designed to lure users with a search query related to evacuation maps. ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/wix?keyword=alameda+county+map+evacuation PDF link annotation
    • https://cdn.sqhk.co/bebofuwe/qggqhjo/video_avi_to_mp4_converter_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xamozafi/ibWFGxG/body_systems_web_worksheet_answers.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/20399975230.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
    • http://milebulijulami.onlinewebshop.net/watuvenilot.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/gubuxatalepabojefede.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/zokugiwegibogo.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/lista_de_adverbios_em_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/2017989783.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/list_names_of_sheets_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/what_is_second_order_derivative.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/bayan_video_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/sales_director_job_description.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/how_to_be_a_bawse_audiobook_free.pdfIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_14d921d7b8794a62ad970a483d37a1e7.pdf?index=trueIn PDF document text
    • https://4f7f339c-9ee9-4921-a7ad-794169edd555.filesusr.com/ugd/fea72b_0a92701b6cae4a8c86a80e39b57e2ce2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/vekinezomofamagimifo.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/6063083763.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/google_docs_resume_template_gallery.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 4976 bytes
SHA-256: 62c7a027c058007e132dd35c90783f307da98295bdcd1f00af5741573e9aa37a
font_01_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 10828 bytes
SHA-256: c615e7b4c168050cf9d96ea7058b325ba4276b0dc9005d4bce1970122f28c6bc
font_02_sfnt_off000128ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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