Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79c6b22be4e0da0…

MALICIOUS

PDF

75.7 KB Created: 2021-06-06 02:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c370223278d75d78e7a16c07253eb564 SHA-1: 2989bf930ea9adb962f4c3b1df339be780d37828 SHA-256: d79c6b22be4e0da07d227cd194a72dbaf09db587c1d616f2f778e79d8ddd9e50
126 Risk Score

Malware Insights

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

The PDF file is detected as a phishing trojan by multiple engines, including ClamAV and an ML classifier. It contains numerous embedded URLs, with one specifically pointing to 'synerhu.ru', suggesting a phishing or malicious redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synerhu.ru/pbw?utm_term=how+to+check+ac+pressure+without+gauge PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381964/normal_606dd7fec4a34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_60300932ddcd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_6003edb8a9321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446490/normal_606189228aa2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_60314b40012d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392457/normal_60bbf40fb717e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407314/normal_60b94257f2aaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_6010b671b08d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480580/normal_600e72a47629a.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/6e87a2aa-ae2c-4cbb-87e5-e95267bfd654/how_to_replace_whirlpool_duet_dryer_door_latch.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/encyclopedia_judaica_vol_21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/780d3b27-11db-4d93-b12d-7789bd21f0b5/barbie_mariposa_and_the_fairy_princess_2013.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/how_to_hack_someone_cash_app_without_human_verification.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/f/how_do_you_pair_e18_earbuds.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144483114/fosekiroxotubitax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0397e4ad-a9ea-4b5d-8a6b-e239a4bdf418/63889371177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf236cdd-fb5a-4c76-8dba-ab0fd3be8cb9/what_do_social_justice_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15341a5-0cfc-4f75-a708-500f7d21a386/18683654918.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/w/file/fetch/144425409/66104599247.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144651057/agneepath_full_movie_amitabh_bachchan_mithun_chakraborty.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_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 5280 bytes
SHA-256: 5aa3a285f3167df1efa3eb717a2ec27099106a8056299cb6be5fad3c28c5237d
font_01_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 10232 bytes
SHA-256: 20a4847dbb5b8adc525938e46cc8ae8c251ea5c785136439fde91f34d9580fb4

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