Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6598c6386725b62…

MALICIOUS

PDF

71.4 KB Created: 2021-01-03 15:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 82f7c40c9974459b65401e7290ee6934 SHA-1: bc158dcef7a2e7504b71835ceef9a21daed7ce0e SHA-256: f6598c6386725b629aa8bf06474c41e1721e8ec6a578ff991c9c4062867ede65
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://traffine.ru/wb?keyword=weather%20forecast%20florida%20hurricane%20radar In PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/efaac.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/hdgihik/87834220556.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/Kjbdxkj/jurassic_falls_mini_golf_london.pdfIn PDF document text
    • https://cdn.sqhk.co/ladetozuxi/JfOs3ib/dozurinomabon.pdfIn PDF document text
    • https://cdn.sqhk.co/wezokobuli/ijLhdhh/vedipetewaka.pdfIn PDF document text
    • https://cdn.sqhk.co/monazaxumol/8gcjhb6/dibop.pdfIn PDF document text
    • https://xuvunigito.weebly.com/uploads/1/3/1/1/131164310/sutodadiropapiwom.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/16e3cce4-95ef-4d7d-972e-db345b86b886/untethered_soul_michael_singer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f5cdda-c25f-4c74-a385-26101f5a20ca/jack_straight_from_the_gut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0289c432-f845-4e9a-b6c5-0d9fe97fb896/14302950362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/163cd772-79f5-49d6-8697-11a8385eff37/97409869588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b732b8-3434-4032-8cc0-52522db091b1/jasesaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f269b7d-1787-4529-acc2-c7d61f1230be/toshiba_laptop_satellite_a305-s6905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35183565-3755-4627-925f-b73f252e2274/20003347168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39457419-003d-4d01-8136-94196c1b9d2e/manual_platelet_count_blood_smear.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_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 5124 bytes
SHA-256: 42bf8104bcb0739c954c51915fdc425c1f8ae6f328baee47583ad7ddc9bd78eb
font_01_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 10496 bytes
SHA-256: b8b90d5ec2c878862f234f734eb6dbaea6b37b06f615492d6d0e8f2f68b9ef4f

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