Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cbb86d7e43f9e6…

MALICIOUS

PDF

79.9 KB Created: 2021-04-27 09:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4f8b64a90ed5b2611386fb3fae5b8c80 SHA-1: 7a4b4d9d66c8aec96becd4d30261f3119b6682d2 SHA-256: 05cbb86d7e43f9e6125dc0cfa3f4db79ae72232ec6853be36017c3cf30fe720c
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to an external URL. The embedded URL `https://botokaw.ru/strik?utm_term=what+do+the+symbols+on+air+conditioner+remote+mean` is flagged as a redirector for free-download phishing. ML and ClamAV detections confirm the malicious nature of the PDF, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=what+do+the+symbols+on+air+conditioner+remote+mean PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490735/normal_6004be4a45c92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426080/normal_605447a2b8878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_601e538c125f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_6021fcde4069e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_6021174137c10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_6031593befc4b.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/dosipive/96492596369.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/video_show_pro_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/hdfc_mutual_fund_add_nomination_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/federal_rules_of_civil_procedure_26.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/wiguxarinanilup.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/best_food_dehydrators_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/affidavit_of_support_form_dubai.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/star_trek_beyond_jaylah_character.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98146e08-4b9c-4634-9a2a-91a2077c2289/in_the_shadow_of_the_sword_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/63051303884.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/24872492011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4455907d-557e-4288-a978-61929ee1a1b9/13268850167.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/greek_god_family_tree_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/eclipse_for_ubuntu_14._04_free.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_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 5224 bytes
SHA-256: 3a9a1fce894ddc3088abff02b01c539f0d33829027cf8e4ce6bd21b3cb766018
font_01_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 10984 bytes
SHA-256: e58134366605e1e46e84ed172169d3b44cb9bcd16d53abc22dc1162645250431
font_02_sfnt_off000121d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D6 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71