Malicious PDF — malware analysis report

Static analysis result for SHA-256 61497fbd219ed721…

MALICIOUS

PDF

85.9 KB Created: 2021-03-10 15:47:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5e0ff8396c7ca8a9775a86f031aa2d2a SHA-1: d6f2ab52045c4f20cd0f7e46b1d374baa8d6b6b5 SHA-256: 61497fbd219ed721f9a82ed2e35d12763eb2587681ad02eee2d107ebc2ecfb5f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF files, many hosted on disposable domains. This pattern is often used for SEO manipulation or to distribute further malware. The presence of multiple external links suggests an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=alcanos+del+1+al+100+nombres+y+formulas+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483335/normal_6023db3a50a64.pdfIn PDF document text
    • http://getsol.xyz/72783356487fy1mp.pdfIn PDF document text
    • http://sellamorem.com/vedafegojesoperibigozat2vp8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477615/normal_5fd06f43e7a3c.pdfIn PDF document text
    • http://jobesagaponapa.22web.org/kendo_grid_column_html_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_60351cb8908b9.pdfIn PDF document text
    • http://blu-ital.space/2550489616zr4pa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_603024080b7a2.pdfIn PDF document text
    • http://gladkoe-telo.xyz/fire_warden_100x_manualfbamv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xokesuluz.epizy.com/pagoperusapovavakofalogod.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/tasajukexabubo.pdfIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_399efa057d20428598340bcab42cba75.pdf?index=trueIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_bc74791ea0b74a528a44cc8a6799cddd.pdf?index=trueIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_a120cc46f0e94d5fb5a849220a480e5c.pdf?index=trueIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_cd545900785c47cc88ff5a040c2a8ca0.pdf?index=trueIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_3724dc56ec7849a4943c2bf803a3235b.pdf?index=trueIn PDF document text
    • http://datidalumoz.rf.gd/73129510765.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/soxarotilog.pdfIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_a0b58611e9f14b55bbd075ec510b0298.pdf?index=trueIn PDF document text
    • http://befexobi.epizy.com/zawovosidasopute.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_505fdb65e1db47138b83720b93b93721.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 5724 bytes
SHA-256: cec3aaccbf7e2fbee163f899185d9e828dfa9d23fb74b09e7cf85c26119127e5
font_01_sfnt_off0001073d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 13704 bytes
SHA-256: 6b95e991b0d023e4e582511a2a784d7bbf338959783835558267dda19d125340
font_02_sfnt_off00013170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13170 17096 bytes
SHA-256: 9252c313d2ead85640a11cf594344cc30853c15b53cd35ad70349af361437174