Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a776e0ecc98737b…

MALICIOUS

PDF

77.8 KB Created: 2021-05-16 05:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a3fc8ae3c6cb5983f8f53622911ebe0e SHA-1: 03dc6a2dfabb64c47fe0414148cd08563b9ffd51 SHA-256: 3a776e0ecc98737bc32d59c3b1d652dd0683372b41838a51efcc15a0356ab5e4
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to technical issues, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=why+won%2527t+my+wired+connection+work+xbox+one In PDF document text
    • http://blognews.top/what_is_the_gravitational_pull_theoryvjmtm.pdfIn PDF document text
    • http://goloszauniver.fun/fejuwf3wfh.pdfIn PDF document text
    • http://idealicaufficiale.website/living_air_purifier_xl15_manualgtfii.pdfIn PDF document text
    • http://winsl.space/ct_course_full_formopujf.pdfIn PDF document text
    • http://xosukesodur.22web.org/rojok.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/jugutowuz4to4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5fe52d249de10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455370/normal_600c59a40a9a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482228/normal_6041b39be1764.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477401/normal_5fdeef0cdac86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408001/normal_6067244242c61.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/3674645465.pdfIn PDF document text
    • http://raftgjgr.space/kenmore_he3_front_load_washer_repair_manualm8ugs.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/4651a787-9be2-4326-90bc-a68fbb3f4b94/human_trafficking_in_texas_articles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c727e80-7790-4b66-9ae0-8823fa065605/97940915802.pdfIn PDF document text
    • http://ramejepazino.rf.gd/davv_cet_answer_key_2018_group_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/710c3c24-fb00-4f38-9e09-e6d892280807/hyundai_sonata_maintenance_schedule_2011.pdfIn PDF document text
    • http://wivowutone.epizy.com/blank_white_paper_on_white_background.pdfIn PDF document text
    • http://sibovup.epizy.com/multiplying_and_dividing_radicals_worksheet_answer_key.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/18671668961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64913859-8e78-468e-84c8-9e23fde162bd/75370324540.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_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 5272 bytes
SHA-256: ffb56e4225f1b787b4304055058f4f1017effb7c3cb2455864e7a71b734c4436
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 10732 bytes
SHA-256: 64cd3228b66824e90fb2e0cd680c62eeb4beeef2a9bbe0698de1f79e55ecd4cd

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