Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b98fe085b4d08c5…

MALICIOUS

PDF

74.8 KB Created: 2021-05-31 23:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04bb400a5df3b37955d8d0723b8da2d0 SHA-1: 4c9936ae2a8143e0b36f72630b2bfeb21195d95d SHA-256: 7b98fe085b4d08c59c16fb2147e71705e49843655919059b712ca46e0e0c153c
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URL, 'https://coretry.ru/pbw?utm_term=dina+thanthi+news+paper+today+pdf+free+download', suggests a phishing lure related to downloading a newspaper, which is a common social engineering tactic. The presence of a download button heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/pbw?utm_term=dina+thanthi+news+paper+today+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418764/normal_5ffa51d4b4875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483839/normal_600e225dbce33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443802/normal_603c2cded15f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450634/normal_5fcdb85279243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407084/normal_6010439ed3382.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/194bd354-4eb5-4a17-a481-b486f6f17368/why_is_my_galaxy_s6_not_connecting_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0acd675-161d-4cb7-86f8-cf8a23dc68ac/gagimeniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/432862ae-0cb8-45f6-8992-26b29865140a/89451280148.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/22273944312.pdfIn PDF document text
    • http://garifukedako.pbworks.com/f/how_to_get_android_imei_number.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/65338505592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecfb4a60-1dde-4548-91d1-371dc60e17b7/11586465260.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/xofujabijabogukupitak.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/bandiere_del_mondo.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/is_code_for_bulk_density_of_aggregate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bce2225-2b16-4603-827f-d107dab03f44/16113925996.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/f/dopumef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff9fbca-d530-4ba7-8064-016fab41d9ea/96152904987.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144420903/is_there_an_equalizer_for_spotify.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e1a9e0c-10b0-4ce1-8516-95e098c64b50/how_to_recover_deleted_photos_from_android_gallery_without_backup.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_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 5324 bytes
SHA-256: 0197116bdfd2a40522f0c73f086f35999a2e3913caf2b14944f2422c8cd4ccdf
font_01_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 10928 bytes
SHA-256: 6d41a17b92406b1cbe98676a65912fab646835f6b7b23262f78ef7693dd837c7

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