Malicious PDF — malware analysis report

Static analysis result for SHA-256 28360ceaf9edb99c…

MALICIOUS

PDF

79.4 KB Created: 2021-03-30 06:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4ad783fc94bad7eeff5ed991822198c1 SHA-1: 569da332b7fe60b39fdfddb7705d02987707290d SHA-256: 28360ceaf9edb99cd2519b15f71c02929b8c352f172c99209b8ea4def0283651
186 Risk Score

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 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.
  • 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://jumiwimov.ru/strik?utm_term=microsoft+project+2013+free+download+for+mac PDF link annotation
    • https://gogipemefa.weebly.com/uploads/1/3/4/4/134471158/6334852.pdfIn PDF document text
    • https://vitasexabu.weebly.com/uploads/1/3/0/8/130813400/822334.pdfIn PDF document text
    • http://alexsaf.ru/afro-_cuban_rhythms_for_drumseto0ugh.pdfIn PDF document text
    • http://agent-spv.space/24487264657iojk2.pdfIn PDF document text
    • http://wirelessinfo.ru/wibatugobobawog12eso.pdfIn PDF document text
    • http://13millions.store/46063886490qj15d.pdfIn PDF document text
    • http://bluebadgeform.com/jbl_flip_3_bluetooth_speaker_price_philippinesuel9w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_f78ffdc75d8044288f3232ac22f3d9df.pdf?index=trueIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_caf626d6113a48938b18e52c8c6f0567.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_7f47e003bf9349449577fbc816288a89.pdf?index=trueIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_5d35eae9bfcc40d0a39fd538384c2a77.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcba39ba-5b60-438d-93e7-f6cd9b93456f/1200_calorie_meal_plan_to_lose_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f91e41-2d15-43e4-babb-5165cf069e2f/gunexafuzogerob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb3c184-f39a-435a-863a-f2a89aa10f1a/ingersoll_rand_2475f14g_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/230e1d19-a30d-4aa9-9367-f333bb07ef27/why_did_the_northern_renaissance_start_later.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb276fe0-d135-4597-b6c6-d369e0b446f3/crossfit_workout_tops.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93cba443-0f3a-415a-a006-694a5635c5b2/46186391529.pdfIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_92833c29b79f47a09c8186890756172e.pdf?index=trueIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_f4db26a09cf0460c9c35cb7be2103015.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bcb668a-ee7e-4f74-91b6-ef9461621e35/does_bose_wave_music_system_3_have_bluetooth.pdfIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_f09379dfd9564ebd8b7e1330d3e57292.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_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 5964 bytes
SHA-256: 364a4699924885032882ea5c86819d1fb5d6dd0d973e9b1f2178abc873993fe4
font_01_sfnt_off00010b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 10760 bytes
SHA-256: 04bd2beb582b2474371012ee2065017f619524321c152d432149965240186162