Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba703ff7f1d40c6d…

MALICIOUS

PDF

79.3 KB Created: 2021-03-11 10:09:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f70a94e5cc49d0c2f3b2f489a0b08431 SHA-1: 8306d2f7d045e81d05707fed5e734d1263d33236 SHA-256: ba703ff7f1d40c6df24aa217f381d73b01ead898b40f3de4ddd6353e938f2bc1
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malware or lead to phishing sites. The ML classifier strongly indicated maliciousness. The presence of embedded URLs and the overall structure point towards a malicious document, likely used as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://mezovuduw.ru/strik?utm_term=practical+reliability+engineering+pdf+download PDF link annotation
    • https://tekemuwuva.weebly.com/uploads/1/3/0/7/130775778/setotekomuz.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/roadmaster_granite_peak_bike_seat.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/does_dyson_have_sales_on_black_friday.pdfIn PDF document text
    • https://tisowatotaf.weebly.com/uploads/1/3/4/6/134660149/4406a90d9b39995.pdfIn PDF document text
    • https://bafuzonexive.weebly.com/uploads/1/3/0/7/130739369/c92523e55fe.pdfIn PDF document text
    • https://sitakubijilu.weebly.com/uploads/1/3/0/7/130776110/wunotipivubo.pdfIn PDF document text
    • https://gokaxavel.weebly.com/uploads/1/3/5/3/135316782/6567007.pdfIn PDF document text
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/943fbcf2db40071.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://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_5a2e862ba6a34b0f9a78640da7c51975.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/carl_schmitt_political_theology.pdfIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_c497dc64cc0f47728098a316aa26646a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d84cb8-242d-4dcf-8681-46bf957dafb3/jamoforajetozedusifupig.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_1b662baedd894a6fa52a01ad64db82f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/237383c3-4a1f-4c94-9a05-46ae1c2fa6c6/kubota_bx_attachments_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/admission_ticket_invitation_template_free.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_5b1ed248a096466ca18af364ce8e2970.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/8194229398.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/992008705.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_35fc3f430aa84f5d8a3160e6fc9b502e.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_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 5268 bytes
SHA-256: 98c5cc811a2b24014a91a087296e2268fd2b71fe1c9a10067945ea9e2c0beb67
font_01_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 10340 bytes
SHA-256: 3add783d4149bd010193502469e630afbe9727f9ad3474c553a0d9eddb64ce5c
font_02_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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