Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d473bf0dbcb17e…

MALICIOUS

PDF

71.5 KB Created: 2021-01-28 22:07:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 45325572bc5ff8adee3ace034400d505 SHA-1: 304287577cf0087bcf201e75b569a9ca106e1418 SHA-256: a4d473bf0dbcb17ea04b297c640efacbb5ab283e400a843204e8a5292d9f7e4b
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The primary function appears to be directing users to these external resources, which could be used for SEO spam or to deliver further malicious payloads. No scripts were extracted, limiting the analysis of direct execution vectors.

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://traffset.ru/wb?keyword=sound%20physicians%20emergency%20med PDF link annotation
    • https://cdn.sqhk.co/walamalesumi/QJhibij/wafer_warpage_measurement_method.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/athcaJ8/dr_dave_chokshi_family.pdfIn PDF document text
    • https://cdn.sqhk.co/vofaruvukuk/j7hjId0/71540748102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380226/normal_5fde2de25e4a9.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/b4e92d93377e.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/H6pghFL/aircraft_drawing_step_by_step.pdfIn PDF document text
    • https://cdn.sqhk.co/duzixulok/fSgdUgc/51575961510.pdfIn PDF document text
    • http://gatorama.fun/servsafe_manager_7th_editiond377s.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/giaCKkC/huey_helicopter_3d_model_free.pdfIn PDF document text
    • http://sberbank.link/kujamudururia5r8.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/6483219.pdfIn PDF document text
    • https://gelowabizum.weebly.com/uploads/1/3/1/3/131398428/ripofotapelu-venedob-napox.pdfIn PDF document text
    • http://xbet1.fun/37680530536k2oxx.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/cic79ib/vitogomedosuboxegokuv.pdfIn PDF document text
    • http://zuvels.xyz/rubuxuzuputukokibevamikpwia0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465538/normal_5ff8bcab8b999.pdfIn PDF document text
    • https://neseroto.weebly.com/uploads/1/3/5/3/135326238/renim_dujonoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482188/normal_600f657d2b8f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/zesapuxepadifukepemediso.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 5660 bytes
SHA-256: d71807bd21f4f7e4dda3fe9b97bb309308fead7bef251a2c95de03d0ddf4eba6
font_01_sfnt_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 10452 bytes
SHA-256: 8b300cb4c8d988d104f13bd9a35c1f58343da64f5bbed09424102ac5559a8758

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