Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7cffc8dec08922…

MALICIOUS

PDF

88.5 KB Created: 2021-03-14 06:21:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f464f75c77c508ce71d0b111d62ac7cc SHA-1: ced4cf5b8019af886da4c634da0fce85e3f436e3 SHA-256: 6b7cffc8dec089224cab741bc0113af1e7770d598e7c6cae8fbea53347daf70f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to 'phonics test for grade 2 pdf', suggesting a lure. Numerous external URIs were extracted, with several pointing to disposable hosting and potentially malicious domains, indicating an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gimoguvi.ru/award?keyword=phonics+test+for+grade+2+pdf PDF link annotation
    • http://raifaisentgo.online/bodas_de_sangre_pelicula_2018nvi5f.pdfIn PDF document text
    • http://scandisvet.ru/why_does_my_fire_alarm_keep_beeping_after_changing_batteryxasuj.pdfIn PDF document text
    • http://nonretloli.site/how_to_use_corningware_browning_dishp6ihv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480174/normal_5fd08fc368a1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408475/normal_5ff2a6b5a2f70.pdfIn PDF document text
    • http://startbastar.online/xoxekiruwaguso1n4fm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470028/normal_6028a47eaddf5.pdfIn PDF document text
    • http://topuniversityru.fun/62633027872xv22h.pdfIn PDF document text
    • http://fb-ig-violation.com/impossible_quiz_answers_level_72o8lkx.pdfIn PDF document text
    • http://leopards.space/zelerosojimarusdrjs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368487/normal_5fdd4210bef70.pdfIn PDF document text
    • http://hotloveme.online/pivulunoxetekg9za.pdfIn PDF document text
    • http://igafnd.org/569195130767pidr.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/10da0654-3199-43fc-8eb1-7630fc0382a7/32035002145.pdfIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_ec43b3b8101c4ba388790f2bca44fc1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9cc53f-5197-401f-b519-88d57e14db61/25148233916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c364d8-872a-4b90-9d60-b59dbabea79b/59943117086.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_6078bf111f27464ab968fc99ed4f60fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5bef90f-ca21-423b-ac79-e716046111aa/lubidelunuremapoduvazenod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b73334-1664-42d8-8afc-0a0e4708cbb4/california_leave_of_absence_chart_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/908f5aa7-a271-4169-942e-66ec88b125b9/motorola_ht1250_battery_indicator.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_7ebd0daf1d524854bee2385d8150ab11.pdf?index=trueIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_92682d712d794b899930a0a8189f3be2.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 5520 bytes
SHA-256: 149a91c87f3ac8289dd04a9f5a78dd723bcf6f2bb218e2ec2bb69704018a3c36
font_01_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 6468 bytes
SHA-256: 3674cac2bcb0de4bec9a4495e83ec1cda6726955840a94489f07a1affc3e4633
font_02_sfnt_off0001141c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141C 12308 bytes
SHA-256: 35f2a10ef7bbb659be17f8c3ae36e6ce5c15d163f2b34041db99a2e5ad3a9d48
font_03_sfnt_off00013e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5A 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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