Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf735cd838ed61d3…

MALICIOUS

PDF

82.4 KB Created: 2021-03-08 23:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2946f5d713924dc1e532dceb32dac711 SHA-1: ba68dea4a352b982c2081924775941d70cf9ec0c SHA-256: bf735cd838ed61d3c9013a199fceff3eccd10af9d0a4b658520c3bacfff58161
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDFs, suggesting a link farm or phishing attempt. The primary URL, https://dafemum.ru/award?keyword=bridge+to+ielts+teacher+s+book+pdf+download, is presented as a download for an IELTS book, likely a lure. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/award?keyword=bridge+to+ielts+teacher+s+book+pdf+download
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/vuvururusolego-nuxumofefewiw-lamedilududane.pdf
    • https://wisufomerimugil.weebly.com/uploads/1/3/4/0/134016782/papanepelaxonug.pdf
    • https://cdn.sqhk.co/panuwatosim/Eii4hhY/top_100_rarest_pokemon_cards_list_2020.pdf
    • https://jositaloj.weebly.com/uploads/1/3/4/0/134042718/213077.pdf
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5fdafc5a601ad.pdf
    • https://static.s123-cdn-static.com/uploads/4426422/normal_5fddfe615aba0.pdf
    • https://cdn-cms.f-static.net/uploads/4499002/normal_603719f5d7598.pdf
    • https://cdn.sqhk.co/jewimebobi/1A0ihjf/zomubalafivufifefumur.pdf
    • https://nepunifanod.weebly.com/uploads/1/3/4/5/134524507/6e719042bb9d5a.pdf
    • https://static.s123-cdn-static.com/uploads/4392444/normal_5fc86dd652641.pdf
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5fe8d887d3661.pdf
    • https://cdn-cms.f-static.net/uploads/4369187/normal_602e2ef19c1a2.pdf
    • https://sorawujij.weebly.com/uploads/1/3/4/6/134671526/3e653.pdf
    • https://cdn.sqhk.co/xoberuweri/dheZKmE/tibufavusudadisi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_89f71d8ca6e54ce2bf6f73650552fdc7.pdf?index=true
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_4ef5ebc69cba4353a2fdbb292c8b499c.pdf?index=true
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_8eba953c27fa466ab820fd11956ae6b2.pdf?index=true
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_3573dd82d30647e5932e67f0c3decdb8.pdf?index=true
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_3d437adb23824138a324d34028fcda7c.pdf?index=true
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_da4e4399aca741deaed47c1e49477a47.pdf?index=true
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_d7507d33d6d94851ab2b850b8472aa6e.pdf?index=true
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_03bc5c5bc638499986f094e50ed1628f.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd3.bin
a865d067995024f6765cfce2547d48ee2da08e93562fbab905b004707aae6f02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 5760 bytes
font_01_sfnt_off0001037b.bin
1c216916ba62aaab76dc449827cafcca4e492c6edde07654290314a938dfb5b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 10328 bytes
font_02_sfnt_off00012715.bin
5d72d630640305d452d914085fd6c65e0d8125198bed8028c282d44fd0327be8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12715 16068 bytes

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