Malicious PDF — malware analysis report

Static analysis result for SHA-256 21acbb41ca0290ec…

MALICIOUS

PDF

76.4 KB Created: 2021-03-10 12:27:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc45e0a612aa8de9be8600ecdc7aa40d SHA-1: 767273d5ea1d601d3bf3f09551baab9456da1e93 SHA-256: 21acbb41ca0290ec14fc4adf253e3a65a075bb6791d3880f7cb4499dbc967be4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files with numeric slugs, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/award?keyword=bticino+living+light+pdf
    • https://cdn-cms.f-static.net/uploads/4403404/normal_603f0bc42f721.pdf
    • https://pijolonaponezu.weebly.com/uploads/1/3/4/8/134879261/bujiwuzekar.pdf
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/29202.pdf
    • https://cdn-cms.f-static.net/uploads/4484635/normal_5fd7cc90038e5.pdf
    • https://verulezame.weebly.com/uploads/1/3/0/8/130814285/zelakekizabebafi.pdf
    • http://sputnews.com/warmachine_rules_mk3edszr.pdf
    • https://static.s123-cdn-static.com/uploads/4451049/normal_5ff38f15e36e4.pdf
    • http://8bitbeardsco.com/rerenodimobujikudiporbyzk.pdf
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/1427c4.pdf
    • http://wiinorama.space/2006_honda_odyssey_transmission_fluid_filterigqqz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dab001fa-6054-4c3c-9e97-bbe3a1f2d813/tutalubeg.pdf
    • https://uploads.strikinglycdn.com/files/db17a722-f6ce-4d72-bbf5-a68c56d269f4/samsung_p2770hd_standfu_entfernen.pdf
    • https://uploads.strikinglycdn.com/files/5bd9ec41-07a2-49dd-ade1-0a76e2fe8982/wapilojopekupad.pdf
    • https://uploads.strikinglycdn.com/files/976319d5-6b9b-4be7-b62c-ae8c9f2f251b/zujepufedatitu.pdf
    • https://uploads.strikinglycdn.com/files/a02f6b25-c26d-4e71-a75c-f6732a8cbbbf/ubiquiti_nanostation_m2_loco_m2_wlan-access_point.pdf
    • https://uploads.strikinglycdn.com/files/49903213-86ce-4ec9-9a8c-bde6406bcde0/what_are_the_three_types_of_automatic_processing.pdf
    • https://uploads.strikinglycdn.com/files/a41e8d45-0a70-49b1-8f94-eb12955ba409/vigenugafes.pdf
    • https://uploads.strikinglycdn.com/files/1e09203d-f6f6-4b4e-8822-840096e81d1a/78155191018.pdf
    • https://uploads.strikinglycdn.com/files/41972c36-6d92-4016-af52-241351f4514e/22348857059.pdf
    • https://uploads.strikinglycdn.com/files/b6a61672-9ce0-4fbc-9c53-571cb53a09b8/who_are_the_pimps_in_norbit.pdf
    • https://uploads.strikinglycdn.com/files/7eff9ede-26d0-4ed2-93b4-285854f5d232/47966233694.pdf
    • https://uploads.strikinglycdn.com/files/6c0ce61e-a2ec-4c38-8b59-67a2d35969c8/50580967488.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef35.bin
d3be13240873910f820b429a82280d67aac8085c5b0316ed157e960b4587b5f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 5044 bytes
font_01_sfnt_off00010071.bin
5ab729edc585ca349a5c30430ce1f9af10a8ecb51d11b4222cd79453e0fb7150		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 10640 bytes

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