Malicious PDF — malware analysis report

Static analysis result for SHA-256 242c7890c3cc88d0…

MALICIOUS

PDF

82.5 KB Created: 2021-03-28 22:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9f182a99a7feb8dbc9eb232f84bfc72d SHA-1: 573550ed8b567094515b892840b9b2d43b441969 SHA-256: 242c7890c3cc88d09a4331f294cad5e0b0434ad766316bb044f97bf71e937f51
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it is a link farm designed to redirect users to malicious sites. Specifically, the URL 'https://ponafet.ru/strik?utm_term=catholic+minister+salary' is present, and another suspicious URL 'http://salonop.xyz/zovunawijipidk09i.pdf' was identified. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/strik?utm_term=catholic+minister+salary PDF link annotation
    • http://salonop.xyz/zovunawijipidk09i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_6059e5f41811d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456369/normal_5fd39eb03badf.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/c8jjxie/bluffton_south_carolina_weather_march.pdfIn PDF document text
    • http://usechambre.xyz/toronawunapekiledokumirijhgko.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/jbhdihW/jilomimumos.pdfIn PDF document text
    • http://elerctum.org/83989489613hzccl.pdfIn PDF document text
    • http://helpcenter.business/what_is_bcnf_in_dbmsidpd3.pdfIn PDF document text
    • http://bitcoinov.site/939301304110tb3y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_5fefb57ca8c8e.pdfIn PDF document text
    • http://save50it.pro/good_faith_marriage_affidavit_letter_samplep9ec1.pdfIn PDF document text
    • http://social-whisper.ru/marvel_s_avengers_demov9799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_5fd79dd672182.pdfIn PDF document text
    • http://milktree.store/68533620779q6slg.pdfIn PDF document text
    • https://cdn.sqhk.co/doxanusubomo/fja3Xgi/flukey_luke_episode_guide.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/mavixu/format_of_newspaper_report_writing.pdfIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_434ebfb107eb484f9f9709f9eb77ae34.pdf?index=trueIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_6c737872f4cb4e40b1512bf1c5a53945.pdf?index=trueIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_09bc947dab4945ac80c9d616ca96b0d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukusa/18575181487.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_36a147a8717342b69a7fc10bf5c535ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/net_framework_free_softonic.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/gufikajotobonuvuj.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/aprender_italiano_gratis.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_92c6c2e1ef2543578bb2cb2b6badf37e.pdf?index=trueIn 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_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 4952 bytes
SHA-256: ce7924c88c2139ab0d9b3631851348ea9c45b7d7f79a583dddd404494f53ac19
font_01_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 10460 bytes
SHA-256: ea0551f739bdb4116564f99c69055880b5eebbd8f6626853fe1e530d2d1d06d2
font_02_sfnt_off00012dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361