Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f38d58d231e59af…

MALICIOUS

PDF

81.6 KB Created: 2021-03-17 02:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 24730a15219d5025680ca095f1110aee SHA-1: 67452cbc9ed9819f7a830996cb9ecc52758391d8 SHA-256: 5f38d58d231e59afaef0b7ca0280d8c387b98de58e0a961f45f2d571150ca4bf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to redirect users to potentially harmful content.

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://nipisod.ru/award?keyword=intracapsular+cataract+extraction+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461245/normal_5fd15899f3186.pdfIn PDF document text
    • https://cdn.sqhk.co/faxotuxoro/ijjsgjo/48742321118.pdfIn PDF document text
    • https://cdn.sqhk.co/juvekuvop/Kj7gcif/slimming_world_free_foods_list_2017.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/papex.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/23gcgdS/jepebeladobirap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5fccd53537e93.pdfIn PDF document text
    • http://tonukavugu.mygamesonline.org/xofazawojewu.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/4wsieii/european_rowing_championships_2020_results.pdfIn PDF document text
    • https://cdn.sqhk.co/besudamuge/R9ha1Y2/vaseline_glass_value_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://davofunup.onlinewebshop.net/41982922610.pdfIn PDF document text
    • http://tigagatu.atwebpages.com/ximodutogiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/pioneer_vsx_521_k_no_sound.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/2019_calendar_with_week_no.pdfIn PDF document text
    • http://pudosuvosav.atwebpages.com/nufoxiwumebosipovesurabo.pdfIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_b70a39fdf63c4753988073712498ffae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78051d52-76de-4e72-970d-2ea0272f6efc/63342994060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d62273-2347-492e-8826-10fbb3c7e6d5/white_string_christmas_lights_led.pdfIn PDF document text
    • https://0404cab7-c021-4537-be79-420bcb2f88cc.filesusr.com/ugd/52c240_880e01f97ec547fcbf922b589a48401d.pdf?index=trueIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_66a25ccb15bf4f879d10debc7b663eee.pdf?index=trueIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_c3c962b0ae054706b91153469b5dc17d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd665553-d70a-4728-84c4-a5836a8dcaa4/gobodopuwijewizazixelepuk.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_dcaad79e2a76498f858dc8e134edb02a.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_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 5152 bytes
SHA-256: aaf88d5e540a76bcd138c1c5659794f8ff3d39a7e0c13a62d54e805f50c4664a
font_01_sfnt_off00011150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11150 11120 bytes
SHA-256: 8bf544911508d6483b248540602fb9f41216e8d5c68a48f6b4c99a2f4776187e