Malicious PDF — malware analysis report

Static analysis result for SHA-256 e084b2048b2048d5…

MALICIOUS

PDF

79.7 KB Created: 2021-03-26 16:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d69eec0794d93d1ff864507fd7ada88 SHA-1: da2372e0332706579ad52eb381ad964f9b9fac5c SHA-256: e084b2048b2048d58862acdc24d3e5fea63bc7c722bbdc8af8fca32c8c4eca8a
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF phishing or SEO link farm attack. It contains numerous external links, including one pointing to 'xajibur.ru', suggesting an attempt to redirect users to potentially malicious content. The presence of embedded links and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to manipulate search results or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=ge+profile+microwave+convection+oven+not+working
    • https://cdn.sqhk.co/kovajivika/higtHjb/my_android_won_t_charge_to_100.pdf
    • http://leziwazedo.mypressonline.com/cambio_climatico_ensayo.pdf
    • http://polystate.ru/69284709039qmqu9.pdf
    • https://cdn-cms.f-static.net/uploads/4458633/normal_6010ea91778e2.pdf
    • https://cdn.sqhk.co/dabebasavus/cgigfjJ/school_parent_app_neverskip_download_free.pdf
    • http://zathkatow.xyz/navaponrlw9.pdf
    • http://muldwych.com/perogelattsz9.pdf
    • https://cdn.sqhk.co/sivadapexiri/sM3hg4Q/dawnbringer_karma_skin.pdf
    • http://stat-index-co.com/magusubise1cl9y.pdf
    • http://kewatupu.scienceontheweb.net/synonyms_and_antonyms_list_a_to_z.pdf
    • https://cdn.sqhk.co/tuwetebep/rjfqU5C/spina_bifida_causes_and_symptoms.pdf
    • https://cdn.sqhk.co/puxobaku/jcJjiig/gaduwuxonizotifod.pdf
    • https://cdn-cms.f-static.net/uploads/4486350/normal_6043375717a80.pdf
    • http://meetcabinets.xyz/admiralty_chart_catalogue_freekbr3v.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://3d1db4d0-c196-4dd3-8d5c-bb108cafbd43.filesusr.com/ugd/479e38_c29422485d1c4b7fb2e6d132644365bb.pdf?index=true
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_ffee4e4c76af41a399edf743684706ae.pdf?index=true
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_851084f51b42442aa64da92e34119f5c.pdf?index=true
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_35aaf9f5b57b4f39b28227ab96ce3ddc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec93.bin
e6ec70774d26ee344929e08e58924f981871a4dc627c75dcb09c2ff46b54f60f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 5192 bytes
font_01_sfnt_off0000fe3f.bin
73984b64d2ad106c19f24b2d75614e88aec660b78735b736d3804e9436d4ff97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 11324 bytes
font_02_sfnt_off00012474.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12474 4324 bytes

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