Malicious PDF — malware analysis report

Static analysis result for SHA-256 645016b884255a6c…

MALICIOUS

PDF

78.5 KB Created: 2021-03-20 02:28:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8b08387528379dd2369d7bf5d9e5d114 SHA-1: 59a7acf9dfbd976c445604c3fda76d0b97cd9e65 SHA-256: 645016b884255a6c78c148bec05f1eaf43954e0925fcc21af3d59d5887e9fa6d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm hosted on disposable infrastructure. The primary URL, https://xezojetit.ru/award?keyword=orthographic+mapping+pdf, is flagged as unknown reputation, suggesting a malicious intent to redirect users. ClamAV detection and ML classification further support its malicious nature, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://xezojetit.ru/award?keyword=orthographic+mapping+pdf PDF link annotation
    • https://pesuzipowezav.weebly.com/uploads/1/3/1/6/131636843/41154dcab.pdfIn PDF document text
    • https://sotugipuzelaj.weebly.com/uploads/1/3/0/7/130738723/9290420.pdfIn PDF document text
    • http://xenuven.22web.org/agco_corporation_annual_report_2018.pdfIn PDF document text
    • https://duludogom.weebly.com/uploads/1/3/4/6/134673238/funemu_denepajixiz_safufibobajo_zusonazubo.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/6451275.pdfIn PDF document text
    • https://bejelasinodajib.weebly.com/uploads/1/3/4/7/134764461/9089358.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://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_86dff19eef044775a1a832c719f33604.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/roware/dosuzisetinesuxowuluseziz.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_be279dc2095c4d53bc04816ed6b11916.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f92a5630-75c2-4911-9603-a64a0d870f0f/1762_if4_scaling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eec5b68-e143-44aa-a0b0-68f9528c3493/hp_color_laserjet_cp1215_driver_mac_catalina.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/balance_sheet_cash_flow_income_statement_relationship.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/28901262938.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/tempstar_furnace_model_number_decoder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af9c733-78f9-48b6-a315-5a7243818479/37021510690.pdfIn PDF document text
    • http://totepotolijezib.rf.gd/14072414915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d167bcd-8f9f-45f9-ab44-f8e304ce6b9b/93134098678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6cddc1-ab10-4c53-98e8-176b1e3fe7ba/kenusimavafijugabumenu.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_19cbe105709b4c74a988bf6f0d6590f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/suxofanazulupini.pdfIn PDF document text
    • http://xumugipetoje.epizy.com/types_of_contingency_tables.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_d4d0c1765e9a4fbcaa8417251a627867.pdf?index=trueIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_a339d35088fd49378da17ce4934fb701.pdf?index=trueIn PDF document text
    • http://wenimawibi.epizy.com/44497535814.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_03336cd1336446f9a033b03dfb2a650f.pdf?index=trueIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_7dd2b7502a554aa6b14735933b5eb4f4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 5056 bytes
SHA-256: 9cd60f8178eda5084922439e79e600ab9345ca85e455801b7f15941fd388575b
font_01_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 10328 bytes
SHA-256: 67741d0dcc0c305d97bca19477a4acc4c8be75e8d39d6c65b2e1866954855f7d
font_02_sfnt_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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