Malicious PDF — malware analysis report

Static analysis result for SHA-256 2664a58013c075e4…

MALICIOUS

PDF

77.6 KB Created: 2021-03-12 21:10:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48bd9fe53d061f12b48c08219877f070 SHA-1: 5c2a9ac10f6715d6a5096a5a210225aad758e907 SHA-256: 2664a58013c075e4a86b0f44763d417c258e6554b7f88374daa76b055d7357ae
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a phishing lure designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://midufefew.ru/award?keyword=job+application+letter+format+in+pakistan+pdf
    • http://zitaranitu.22web.org/nekudibijosemejejejiz.pdf
    • http://doxugivo.22web.org/excel_2007_worksheet_greyed_out.pdf
    • https://cdn-cms.f-static.net/uploads/4461770/normal_602a49cb64ef1.pdf
    • https://cdn-cms.f-static.net/uploads/4369927/normal_600d8ba9cdf9e.pdf
    • http://sulogajifuv.iblogger.org/body_for_life_memphis.pdf
    • https://cdn-cms.f-static.net/uploads/4453560/normal_60494826b4636.pdf
    • https://cdn-cms.f-static.net/uploads/4369519/normal_60208f83f32ec.pdf
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/8918360.pdf
    • http://dizarepozagipit.iblogger.org/what_does_it_mean_when_your_washer_isnt_spinning.pdf
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/zatezanorusu_galanig.pdf
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/kasovofubonedegijika.pdf
    • https://static.s123-cdn-static.com/uploads/4404727/normal_5fdfbaf638949.pdf
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/8564121.pdf
    • https://zirodamabesad.weebly.com/uploads/1/3/0/7/130740068/77203.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/79442d2a-dc84-4632-b35a-1ce6c4085f8a/perezig.pdf
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_0adc64a0eae64325be3d55b72357b2a0.pdf?index=true
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_4a4add1cda1846009de7903696f7c3bd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0e6ded61-0faa-4e85-867e-1877ecb7efcd/confessions_of_a_mask_audiobook.pdf
    • http://gibopaxoga.epizy.com/bubileru.pdf
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_c7a21d6040244877a4b624744bb5360c.pdf?index=true
    • http://gogolozumer.epizy.com/raramezunonir.pdf
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_00bdb60a38424db3b98bec6999d9ee40.pdf?index=true
    • http://sawopigemon.epizy.com/how_to_get_rid_of_page_breaks_in_ms_word.pdf
    • https://uploads.strikinglycdn.com/files/ae3a4e42-9bc7-4020-bbc4-5be787684fc6/on_the_road_movie_where_to_watch.pdf
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_1e2271c8948c47648073ef0409d4e15a.pdf?index=true
    • http://timarerovasezot.epizy.com/98761072917.pdf
    • 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_off0000f21a.bin
e61f1d95856fc2a5f586857cc580e94123a396c66179d5ee6032c25fc769979c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 5492 bytes
font_01_sfnt_off000104b0.bin
e54d243e09109b619fe130fc0209b05a78ad21bf1822995ccf9bcca44450c9a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 10536 bytes

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