Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c62d8501831f05…

MALICIOUS

PDF

78.3 KB Created: 2021-05-28 22:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1a84325d30c724dbdd302d240a320612 SHA-1: 8f0062295ec13a609296ea1d00c2f27984917e9b SHA-256: 84c62d8501831f05e7e286264a350dfe5da87b06e4893c56de89d04d1f48a75d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external links, many pointing to disposable hosting, and one prominent URL that appears to be a lure for 'adobe illustrator certification practice test'. The document body is heavily obfuscated, but the presence of multiple external links suggests the primary function is to redirect users to potentially malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=adobe+illustrator+certification+practice+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417988/normal_602efb38b48ec.pdfIn PDF document text
    • https://nifadajenekipib.weebly.com/uploads/1/3/4/3/134305148/f9dee8f549b72.pdfIn PDF document text
    • https://gugukufetufa.weebly.com/uploads/1/3/4/3/134337187/tuxes_kepogixuzela_gezidaxij.pdfIn PDF document text
    • https://sopazamiwurigu.weebly.com/uploads/1/3/4/3/134387891/be144359b0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454171/normal_5fef579480880.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/kugizakemexir.pdfIn PDF document text
    • https://fivubiforozoxi.weebly.com/uploads/1/3/4/6/134676017/4311758.pdfIn PDF document text
    • https://nijupafubowawiz.weebly.com/uploads/1/3/4/0/134012726/dukawegutoz.pdfIn PDF document text
    • https://tasoxagizuj.weebly.com/uploads/1/3/4/7/134734804/vitakedixamisim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8dfb6cde-5680-485a-b98f-9dacc978666e/wemo_maker_sensor_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df09ac2-29e4-44e0-abdf-2dd17f9498a9/how_to_fix_overscan_on_vizio_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb1f0a5-d109-486a-8d13-189d601a16be/60718947667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e444e40-087c-4af9-b5a4-4cc46f727366/simplicity_regent_parts_ebay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f214718-cf7a-4e2b-b569-beee9f3b8325/35440515230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f435f117-62b8-41dc-8fd5-9460adcd8617/xijigadobezewaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58742ec-ecdd-4a23-877d-c648ee220932/javugig.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 5160 bytes
SHA-256: f2cffd49660e6754c60a70a4b2f601dfc52a8de9c9e2d22d17803b47686ff773
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 11316 bytes
SHA-256: 1e1b96e4813f4022775c2b8b9372be30ddfb60ac8b1d60fc9166a5195abde07a
font_02_sfnt_off00011d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176