Malicious PDF — malware analysis report

Static analysis result for SHA-256 a728a8339d41a7ea…

MALICIOUS

PDF

77.5 KB Created: 2021-04-03 11:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fcbf7957531ada6b37606a99c5f5cbce SHA-1: 0fbc7c0d02277f5aea16950b59db3c619ef2b789 SHA-256: a728a8339d41a7ea98e95e45c6ce809688fdf3a045770bdd4a90b6f7c9ac86c5
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 of which point to disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the structure and heuristics point to a malicious PDF designed to distribute or link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://xezojetit.ru/aws?utm_term=weber+gas+grill+cleaning+instructions PDF link annotation
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/kixipetuze.pdfIn PDF document text
    • http://priz24.site/303084516818e8x9.pdfIn PDF document text
    • http://salleapp.xyz/adobe_animate_cc_2015_crack_free5xyk7.pdfIn PDF document text
    • https://vuvuzuvikedatun.weebly.com/uploads/1/3/4/5/134529562/6245587.pdfIn PDF document text
    • http://drnextact.xyz/bowflex_xtreme_2_se_weightuwln2.pdfIn PDF document text
    • https://lirisuvobuku.weebly.com/uploads/1/3/5/3/135399047/1790355.pdfIn PDF document text
    • http://maxist.ru/gagisokapevarxcqv.pdfIn PDF document text
    • http://moreprodukti.com/127146796597h5wb.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://samettemiz.xyz/gupobisogekovopile1l24r.pdfIn PDF document text
    • http://civiliscmq.online/387854596884dpsn.pdfIn PDF document text
    • http://13millions-warzone.store/botticellis_illustrations_for_dantes_divine_comedy4dhzv.pdfIn PDF document text
    • http://verification-help.com/una_pulgada_cuadrada_en_milimetros_cuadradosavg8l.pdfIn PDF document text
    • https://fojojaroj.weebly.com/uploads/1/3/1/4/131453509/gipivifani-salajij-masilanuzefad.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/boxumuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8daa234a-50bf-4256-b8f6-fbc67b7235ee/molar_mass_problems_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a1a242a-79a5-4a6b-8ab5-ca7b461b4f92/glock_19_gen_4_magwell_with_backstrap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19fc9aae-8751-41b5-8ef9-7e18d5def703/95319270685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4394b892-849a-4d1c-95e3-6c80f8f97471/actiontec_mi424wr_router_default_password.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/suderiludo.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/data_mining_pc_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7119e34d-cfab-42eb-9eed-67d6d5ccb718/whirlpool_duet_washer_fault_code_f02.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e89d592-fb07-44c1-b8fe-b86ffafd7099/pewijenesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4153920-f5dc-4b25-8575-037df5f02021/you_have_been_asked_to_draft_a_document_related_to_evidence_gathering_that_contains_details.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea77bb1-0b81-4c0a-b81e-a6f75d8e0158/fefagikimabiwisisasiwonu.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/buxilo.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_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 5120 bytes
SHA-256: 63ce7b938a0ca5348f6b461e369b7a5d2f2e69265542c793a44b0eabaa2a1be0
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 10768 bytes
SHA-256: 2f4833b5e5401fa3e7fe1ec38bc5184f9006d6dac25d75bc5b2523c3d8f791bd