Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad629e8a0f8c4c1…

MALICIOUS

PDF

77.8 KB Created: 2021-02-19 13:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d55d78e7aa17f917a990496512d6d820 SHA-1: 245a8cb1c4d87482269dd85d27487192187527b6 SHA-256: cad629e8a0f8c4c1530a667b575b54a3bbf6dd561775d9fd898efee7405e4acc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=ao+smith+promax+gcv+50+100+water+heater+parts PDF link annotation
    • http://consequences.space/273523827597mamy.pdfIn PDF document text
    • http://vandify.com/limereve1sl7p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491665/normal_5fef3f113a22e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495838/normal_602aff1302e45.pdfIn PDF document text
    • http://ita-talia.fun/qu_hace_el_corticoide_en_el_cuerpocn99b.pdfIn PDF document text
    • http://xiwasaruv.66ghz.com/78261939059.pdfIn PDF document text
    • http://kismykeitio.best/requirements_for_church_wedding_in_the_philippines_2018ak0pj.pdfIn PDF document text
    • http://puzigodemabotod.iblogger.org/tizoga.pdfIn PDF document text
    • http://beliyden.xyz/how_to_play_multiplayer_on_cracked_steam_gamesro4y9.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://s3.amazonaws.com/rurosaveruk/gisorixipegutupikamegupa.pdfIn PDF document text
    • http://zasuzutan.rf.gd/innisfree_sheet_mask_rose_review.pdfIn PDF document text
    • http://pogedezibak.rf.gd/wulalimukunox.pdfIn PDF document text
    • http://zutawatupasexap.rf.gd/ucsb_chemical_engineering_major_sheet.pdfIn PDF document text
    • http://dudulexo.epizy.com/45108795190.pdfIn PDF document text
    • http://maboruj.rf.gd/63861967330.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/gezotogivo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 5524 bytes
SHA-256: 8da5b1ce47072d0135aa9379349173352f4ab2382fcc8a7976c6c44f47b38371
font_01_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 10948 bytes
SHA-256: 313485f9e1f66cc560d15b1826d87c21b93b081c20cec34711c756b265daa821
font_02_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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