Malicious PDF — malware analysis report

Static analysis result for SHA-256 304df4728f8d808c…

MALICIOUS

PDF

88.6 KB Created: 2021-04-04 02:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8f065e8b28aec93cd362bb0e10e88590 SHA-1: 01270e9b36a7785285cb2d16cf6efb6b63f668ae SHA-256: 304df4728f8d808c5e42bfc7adc2a3bee24c4e1d2b780233454b25b0ba79afdf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('vilenefex.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://vilenefex.ru/wix?keyword=queen+of+the+tearling+book+1+pdf PDF link annotation
    • https://xogepavawoda.weebly.com/uploads/1/3/0/7/130740110/dugewulatizepar.pdfIn PDF document text
    • http://uabiomanix.xyz/cuantos_metros_cubicos_hay_en_un_metro_cuadradof1t7n.pdfIn PDF document text
    • http://miiliioner.xyz/77311209288rerxo.pdfIn PDF document text
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/vudirazapam-jibimejizifevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_602026556bef6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390641/normal_600886d47fe03.pdfIn PDF document text
    • https://jarofipe.weebly.com/uploads/1/3/1/4/131408229/1979953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443362/normal_605b913f91d26.pdfIn PDF document text
    • http://sifasawiseziwi.iblogger.org/46239982745.pdfIn PDF document text
    • http://ionatr.space/halloween_horror_scary_sounds_and_music6aujr.pdfIn PDF document text
    • https://joketivuwotida.weebly.com/uploads/1/3/1/4/131454049/kunigi-bojarerowadebun-luvemofojomo.pdfIn PDF document text
    • https://fegilekupajot.weebly.com/uploads/1/3/4/4/134404616/xunivudor_luwewawe_xekefa_zaxumuzon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421943/normal_5fd09f07dde73.pdfIn PDF document text
    • http://stickerrus.ru/surewetv05iq.pdfIn PDF document text
    • http://salonlabs.xyz/44689121696s56i4.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/f1704200-56d7-4426-8974-6ec9764889a0/newetoxupufuxonorov.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/92684674303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/288d0991-6044-45c4-ae86-723c5302be59/what_does_the_number_805_mean_spiritually.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/933b3fd4-710e-4845-8115-e9e250d552bd/97900653884.pdfIn PDF document text
    • http://bepafazo.epizy.com/vadurox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e64bdcc2-cf97-421b-8902-c435da4fe26d/ruzajobididojuvuruw.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/hs_albsig_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/chronicle_of_a_death_foretold_chapter_3_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/amadeus_system_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/humayun_ahmed_book.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_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 5440 bytes
SHA-256: 06cb72dac3cac4f19a6204d977caab5a1410caf3e2fc8bd4ec3f1d8d7e2c1351
font_01_sfnt_off00012f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6D 11016 bytes
SHA-256: 46816dfb5055d1e1f73518d635818515b56d6684e82379eeda42347ece433129