Malicious PDF — malware analysis report

Static analysis result for SHA-256 8590c9c7e541719d…

MALICIOUS

PDF

75.2 KB Created: 2021-02-12 01:16:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c2c4a300c29fbd347cb6550a977fd47c SHA-1: 9c92c8b44d7b4159452abeea4e204d524df0ef30 SHA-256: 8590c9c7e541719dd79023c7e41bee5541491834d68594503cf95a661b6579ec
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to SEO-optimized domains designed to host malicious content. The heuristic firings indicate that this PDF is acting as a redirector to known malicious infrastructure and is part of a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves tricking users into clicking these links, likely leading to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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/wix?keyword=krups+espresso+machine+871+manual In PDF document text
    • http://klosheff.xyz/craftsman_circular_saw_rip_guide606lf.pdfIn PDF document text
    • https://xoburorabusu.weebly.com/uploads/1/3/0/7/130738623/5863882.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/diaJhc4/veriliwum.pdfIn PDF document text
    • http://regsenatvumen.website/4888227996721056.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/5528166.pdfIn PDF document text
    • http://yourbigdick.space/samujutemavogemari18j72.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/bDDiaTx/25845877407.pdfIn PDF document text
    • http://montana-media.com/buy_real_twitter_followers_that_retweetzgwy4.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/Djiiigc/vanez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dezajok/19756386465.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/41289256834.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/bee_movie_game_100_save_game.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/hours_of_work_averaging_agreement_template_ontario.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/37802877514.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/mapilonufurisadatisusuki.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_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 5468 bytes
SHA-256: c0479dd32f3b20640e99809265000387f187d8315be9d86d7211d9277eb5fcbb
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 10360 bytes
SHA-256: 9311686a1968c685514e6016aba19d42e86fa73e8acc921c38b62096844f914e

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