Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc253e65cbdffd28…

MALICIOUS

PDF

74.3 KB Created: 2021-06-02 10:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1af3b341c92c2db70b1209982e06f8bd SHA-1: ffd8782d550fffe0df9ab95ce6f7e4db0c93faf6 SHA-256: cc253e65cbdffd2876ba1b45f84ad9a0cb90dac0c3d35025cdd2e7123fe04165
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with one specifically pointing to a URL that appears to be a lure for a PDF document. The presence of external URIs and the nature of the detection suggest the file is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://nomylo.ru/pbw?utm_term=northstar+2+listening+and+speaking+3th+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447669/normal_6003d30d4e646.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380380/normal_5ff9cff152e49.pdfIn PDF document text
    • https://livafuti.weebly.com/uploads/1/3/4/6/134628119/senizafuxona-ravejax-mipaxupef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375504/normal_5ff2d7701066a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_603a2bbbd328e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_605bc891bdcd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5fe32d609ac79.pdfIn PDF document text
    • https://kakulekatorud.weebly.com/uploads/1/3/4/6/134681497/7906337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_603a8eedeef65.pdfIn PDF document text
    • https://kasitawudak.weebly.com/uploads/1/3/1/3/131380619/gelijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458137/normal_600a71a8379d2.pdfIn PDF document text
    • https://webebusili.weebly.com/uploads/1/3/0/9/130969565/tizezodap_bemomigugaruf_tafefeto_bojilumiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_6067d8a773866.pdfIn PDF document text
    • https://vafumesaz.weebly.com/uploads/1/3/4/5/134589630/tagesowidasorev-zubaxopufo-muxopexavej-vaxinamilipu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://polubisoxuwo.pbworks.com/w/file/fetch/144493209/helping_verbs_worksheet_for_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86617d16-410f-4386-979e-4a615fe904d9/andrea_turchetti_ravenna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1800ef9-50d5-4998-ad7c-8d58240f6d3a/red_book_us_coins_2020.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144450534/26156931317.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144480315/kalnirnay_march_2020_marathi_calendar_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a96063d8-462d-43ab-a252-ebb89bbf2cd9/95197086158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/770f5196-e5cb-4aea-8c9a-e54bd05f147f/cant_get_paddle_out_of_bread_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c03d1f89-c1a8-4080-a75e-f982b97d0638/nenilufumupidipul.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_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 5632 bytes
SHA-256: 82daa532140f43b8c04746e7fe7fc6563bf4d62a3664de5ac435f07d734f5e18
font_01_sfnt_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 16532 bytes
SHA-256: 1fd725c17a62937b270a4096e528d0d0386b74d3179f846e1829bfc37a80997c

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