Malicious PDF — malware analysis report

Static analysis result for SHA-256 721b2c031344ffa2…

MALICIOUS

PDF

75.1 KB Created: 2021-04-07 02:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 860491b8e422e27ee30a1df6471b54c3 SHA-1: 16f6ad42385b545a01ca49f04b1b4640c8fe206f SHA-256: 721b2c031344ffa253d5cee86f68e06b3ed1d272ed1670e684f62a956859a611
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://xajibur.ru/123?utm_term=happy+anniversary+images+video PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470017/normal_6052d02ed60fa.pdfIn PDF document text
    • http://fumufede.iblogger.org/55545784744.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/vujizunejokadauibr3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386837/normal_6004fe62a2c3a.pdfIn PDF document text
    • http://kungfumalibu.com/biblical_affirmations_prosperityfhihi.pdfIn PDF document text
    • https://golasirase.weebly.com/uploads/1/3/1/3/131384643/5217974.pdfIn PDF document text
    • http://lifeit.pro/how_to_use_insulin_pen_with_safety_needlemp3hc.pdfIn PDF document text
    • http://litamomun.22web.org/graphing_logarithmic_functions_practice_worksheet.pdfIn PDF document text
    • http://jopimutedu.iblogger.org/52946687628.pdfIn PDF document text
    • https://tefakunuti.weebly.com/uploads/1/3/1/8/131871494/7264958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485714/normal_6011eecb2c4ce.pdfIn PDF document text
    • http://helpforteam.com/kodurupusogilamikodajapu0e98g.pdfIn PDF document text
    • https://wabexerimib.weebly.com/uploads/1/3/0/7/130739061/1232303.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/f0150576-a669-4047-ab07-01a8100d8b92/python_list_comprehension_two_for_loops.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3932ecca-97c4-4fff-bcdf-12583d9a51e6/how_to_take_apart_an_ellipsis_tablet.pdfIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_ad0da08ded6540e3a9202b06e34ddfcb.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_8a4767d6a7ca4d8fb1c130cff69d1b20.pdf?index=trueIn PDF document text
    • http://zixoridepub.rf.gd/tejokobix.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_c6f09eee2e694d11a71f733be247c10d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ee5081-3b70-48ef-acd4-fc0a3a44b459/gezixuzanuwul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/191bb558-a025-4d4d-afc6-e52b8faa0d5d/mevoremamelufemuvesi.pdfIn PDF document text
    • https://7162416e-a815-4e2e-b4b4-2f1b6d3d7a1b.filesusr.com/ugd/0723a7_4021686f1c3b45f1bc1bd92ff1940bb0.pdf?index=trueIn 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_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 5368 bytes
SHA-256: 17c3abdf63ddca31d8a70367dff25fee290b29b49d74a49d187486559fe9cd17
font_01_sfnt_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 10324 bytes
SHA-256: 0ffd2dddaa8c9491ab4c5c3dbcb0feb0fe8038a83c94628b01bf2a4f05a3d4e5

Open this report in the interactive analyzer, or submit your own file for analysis.