Malicious PDF — malware analysis report

Static analysis result for SHA-256 52edcc1f82a07177…

MALICIOUS

PDF

75.7 KB Created: 2021-04-16 00:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9c2ea39dc398de6198436f6b59d0ccf SHA-1: 994d80736384e978f972b3d5b5adf121a98ee5f1 SHA-256: 52edcc1f82a071772c0dd75d03d9ad2234d4f41a9cb596af999b261a7dc6a7a7
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating an external URI and is flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The embedded URL, 'https://crophysi.ru/strik?utm_term=how+to+use+a+rug+doctor+rental', suggests a phishing lure related to rental services. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of a malicious document designed to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/strik?utm_term=how+to+use+a+rug+doctor+rental
    • https://cdn-cms.f-static.net/uploads/4375517/normal_603234a4317aa.pdf
    • http://jefuvumerusew.getenjoyment.net/47284638068.pdf
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5feff123bf536.pdf
    • http://modezewop.mygamesonline.org/az_103_microsoft_azure_administrator_book_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sinamozagemoger/einthusan_4._0_apk.pdf
    • https://uploads.strikinglycdn.com/files/77951f8c-4a46-4080-90ff-49a7d6bc0bd4/kalitupedanupasunutinomi.pdf
    • https://uploads.strikinglycdn.com/files/10483c71-ef5b-410a-8288-b3ca61739fc5/80110937517.pdf
    • https://uploads.strikinglycdn.com/files/7d33c753-ff1f-4573-804e-65717bbcccf1/35578262885.pdf
    • https://uploads.strikinglycdn.com/files/37ac95bc-25b6-4b0f-82b7-c2b72065d02a/99467048636.pdf
    • https://s3.amazonaws.com/tabobujimo/verbe_present_simple_anglais_forme_affirmative.pdf
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_87663cde69a94482bbfc58783271d1df.pdf?index=true
    • https://s3.amazonaws.com/lotibabakuj/jemapufuni.pdf
    • https://s3.amazonaws.com/baxegezivumi/32384738895.pdf
    • http://nejimafalun.onlinewebshop.net/al_quran_sinhala_translation.pdf
    • https://s3.amazonaws.com/xabalaru/79883558598.pdf
    • https://s3.amazonaws.com/faluzotixupi/lilimagebosatunemuneg.pdf
    • https://uploads.strikinglycdn.com/files/40a69a89-785e-4a67-9b11-75f8b3d1675b/le_petit_prince_montblanc_notebook.pdf
    • https://s3.amazonaws.com/kiremefegonar/33302828430.pdf
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_ef7173aeff9e427e83b712d10e6d1bb0.pdf?index=true
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_55d5183ac5114ea1a712dd3f12941f08.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7f.bin
b2730c17da566b2ea306471f5f13e5d03c7543d6bb674e8ca6110504779be1d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 5160 bytes
font_01_sfnt_off0000fc28.bin
e64556752340e9bcdb9e5293ce23e71f17115c51da1a8b88bb815a51d24a6d7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 11024 bytes

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