Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9e2df71584b459…

MALICIOUS

PDF

78.8 KB Created: 2021-05-25 12:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0b2c3b51b4e8c98cc3955b168c831ab7 SHA-1: 279879a23fec139a67f2701ade2658f9bd86b980 SHA-256: 4e9e2df71584b459ef7c740b1a5b17e59614f35a544b7cf614132792af014639
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to create a network of links. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or to redirect to malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://fokemale.ru/strik?utm_term=bahubali+2+movie+mp3+songs+download+in+tamil PDF link annotation
    • https://betataniboluwi.weebly.com/uploads/1/3/0/9/130969090/dfde21bcea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459483/normal_603b171e46213.pdfIn PDF document text
    • https://nekusudowup.weebly.com/uploads/1/3/5/3/135315851/bazagal-zugegiz-xipufelufaw-sopajijo.pdfIn PDF document text
    • https://demavagof.weebly.com/uploads/1/3/4/0/134017100/mojumiziwigonamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493579/normal_605d9ab441168.pdfIn PDF document text
    • https://vabudefun.weebly.com/uploads/1/3/0/7/130775589/4881918.pdfIn PDF document text
    • https://gakikodokuni.weebly.com/uploads/1/3/1/8/131857060/f8ceafa2c1ea637.pdfIn PDF document text
    • https://zodefamebatum.weebly.com/uploads/1/3/5/9/135967531/8660f6966834.pdfIn PDF document text
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/1081dff2d9e.pdfIn PDF document text
    • https://wufisosudima.weebly.com/uploads/1/3/0/8/130874090/xinubik_rovovu_jibepazeromir_temupud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448992/normal_604ca56480a6d.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/livivuvuwugeb/mobogenie_pc_2018_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf17fcdf-3bca-4699-911d-86cd31bd41bd/orbit_6_station_timer_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282426cf-eaf2-46b5-a3de-b0d7ab0c797a/nozadonisebezuxobitenuxal.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/22929825348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b660d02f-7ccd-46ea-a09f-1f025781a49b/honeywell_rth6580wf_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a9a3b16-32ce-415d-98e1-b47b1876b5e8/bosigawaladad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34115b93-84c8-41a0-a522-054de852e146/the_last_song_soundtrack_download_free_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6070ef01-9d0b-4ba1-9b3b-1c6ea6bf8f41/98623726843.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/suwun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a577b68d-39f5-49cd-b21b-162c44fb4a40/44920123255.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_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 5912 bytes
SHA-256: a4ce5933ce88fae5766514e377c1c64d1b4b42962e29642d2f4d0e9a62932e8d
font_01_sfnt_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 10564 bytes
SHA-256: 7fb98d68e96c48c0931506f9790ecd1f4a307d8166ed1775f0f135c2ab0e2a55