Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5151c4495b2c0b1…

MALICIOUS

PDF

85.0 KB Created: 2021-03-15 08:01:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4bc8456ddd12977fa0718eba6886d28 SHA-1: 9edecba445f6fbc6cdfbb77321dd521a29c535a5 SHA-256: a5151c4495b2c0b1ff98014444d058a04af6823037a15e15b36e6f55e850f2fa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a large number of external links, including a link farm, suggests an attempt to manipulate search engine results or redirect users to malicious sites. The document body, though heavily corrupted, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO spam or phishing pages disguised as documents.

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://seumenha.ru/wix?keyword=honors+geometry+b+exam+review+answers
    • http://fapubozapanez.iblogger.org/stick_figure_burial_ground_album_free.pdf
    • https://cdn.sqhk.co/xonipavu/gdkcNge/name_generator_ffxiv.pdf
    • https://cdn.sqhk.co/kisereta/gidiiso/56217373586.pdf
    • https://cdn.sqhk.co/wediximewoza/iJjejeU/net_speed_meter_exe.pdf
    • https://cdn.sqhk.co/dapubebireba/dGdJJjj/limuniliwawetorefubigaba.pdf
    • https://cdn.sqhk.co/vinogusi/idof5pL/32392298863.pdf
    • https://cdn.sqhk.co/fedovipawe/dxjfhaP/nickelodeon_kart_racers_2_ps4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c9254e9e-0e71-498a-8384-ab4c929b52b4.filesusr.com/ugd/0699ff_0da0db35ace2465296a5710a85b8cfce.pdf?index=true
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_dd0ec2ea37844e23bf8ffb88a39e23a6.pdf?index=true
    • http://webubekesivamuf.epizy.com/wapking_movie_2019_full.pdf
    • http://rasijubesu.epizy.com/que_es_la_inteligencia_psicologia_y_mente.pdf
    • https://b42dfab6-8227-42c4-8fe5-fc04d9433513.filesusr.com/ugd/a9a8df_460304e7257e48cbbc425134dcc71698.pdf?index=true
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_0f45e404a690462dae54822407686928.pdf?index=true
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_87333664495b4c398e8ea8c2805d938f.pdf?index=true
    • http://lifoluzosuzatus.rf.gd/74348948702.pdf
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_529c6f41f6144a12896e0776a0bb8429.pdf?index=true
    • http://jiforexawa.rf.gd/35053467124.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
    • 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_off0000f7c2.bin
0595ceed0f65789043f04f09846a7e533d3ce574d245e9c43bc90ff8b293deb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 5396 bytes
font_01_sfnt_off00010a1c.bin
56e85d6db2d7dc3aab69d091b5071a9f748238ceb7a43ea5976eef4ba7233408		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 11608 bytes
font_02_sfnt_off000131cc.bin
d667d825703d4aa97f05d05d7d7aac50f467ec87e3a1fd841c84314fc215a209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131CC 16108 bytes

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