Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c27a6c6403a885b…

MALICIOUS

PDF

77.8 KB Created: 2021-05-23 01:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8a28aa7bf9adbe1b9b32c56796c38c8c SHA-1: 42c1c5f5166058271edb4137334d64f861e2f91f SHA-256: 0c27a6c6403a885b4dda150af0fde27cb1b8f15651ae5bee671dcff46dd1b024
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO spam. One prominent URL, 'https://midufefew.ru/strik?utm_term=android+9+1+huawei+mate+9+update', is flagged as suspicious and likely leads to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=android+9+1+huawei+mate+9+update PDF link annotation
    • https://kibirurifawejax.weebly.com/uploads/1/3/4/6/134610443/takefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_60442fd7b0ee2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450034/normal_5fe4d3e0cbb0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_5fd93a1cdaf62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454425/normal_5ffa4644333e6.pdfIn PDF document text
    • https://kadogejajufa.weebly.com/uploads/1/3/4/7/134717900/magonusanu_rokovow_palirezofakak_sekupepod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_605d22b7b6eab.pdfIn PDF document text
    • https://rakafofolobe.weebly.com/uploads/1/3/4/6/134649319/vinobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_60133497b9066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_601721924de71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_600de09b5860a.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/d14081a3-4c6c-4c00-b779-bf4cd625a4e2/kebijuzenuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0050a534-2068-4e11-b2c9-ea3d80d802ef/12325851368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1639ae-e58a-4c67-baca-b3feb91cd92c/fufevibudogureditavomopir.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/codycross_answers_group_21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e8134d-2e6c-42cb-a297-8e92098e846a/98287215779.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/11833007080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd50e80-a4da-42d2-b66f-546111754027/how_to_use_critical_thinking_in_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7186ed-7c26-472e-b6e1-397d699f3d92/rizavoruxi.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/mozibudid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08cdfbe1-04c1-4286-a1bb-9ab68c635aab/batinizuzaziforoloni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b91df9c-39e6-4c09-99e0-119843938ec1/polk_magnifi_mini_keeps_turning_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59830b4a-7aa9-414c-a676-5dc80b3f75af/how_do_you_know_if_you_want_to_save_your_marriage.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/chakram_telugu_audio_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/jatapewigubisaforotiwowum.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_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 5276 bytes
SHA-256: 76d8d43b081579e48f754ee573b05eb04948245388ad1d045abf674f35894cb7
font_01_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 10536 bytes
SHA-256: f0447c1eff8b56f9d58c0721a6a8d26f60408764912312da0e62a49ccbb4f8d6

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