Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd154f02222fe63c…

MALICIOUS

PDF

69.2 KB Created: 2020-12-09 21:33:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec3ac564d6d8583ac0d15789db6e833e SHA-1: 1d44b4145524ae44625b788183eb82f69e43cdea SHA-256: cd154f02222fe63c5effa04a815ef448c3a6ce3ada35f4a488184e21dacda31a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document. The primary attack pattern observed is the use of a link farm to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/aws?utm_term=castlevania+harmony+of+despair+ps3+iso
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/0abf7fc01e6.pdf
    • https://vexepagofebove.weebly.com/uploads/1/3/4/8/134866030/nipove_vetuxoravupo_desegutadidif_mupifip.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/sigamo.pdf
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/7a320c21b2f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc5d156c89e1c4b8fe05cfa/t/5fc9425f56acec624b6bf93a/1607025247515/soccer_hero_apk_mod_2020.pdf
    • https://s3.amazonaws.com/sazariwapa/18646329706.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe10243c02f22b9dd4ef1a/1606291493041/spotify_without_ads_apk.pdf
    • https://s3.amazonaws.com/tadovu/beginning_morphology_and_syntax.pdf
    • https://s3.amazonaws.com/lanowilovuviwib/badupezujetamosesezijomi.pdf
    • https://s3.amazonaws.com/zuponefi/disneyland_california_weather_report.pdf
    • https://static1.squarespace.com/static/5fc78cbdd2523e4b70c2822a/t/5fcb58c8b6b7366152f72f1d/1607162057220/music_player_app_for_android_tv.pdf
    • https://static1.squarespace.com/static/5fc64899f9866f3fd2f86f4e/t/5fc847117ff5a343ebefb3c5/1606960913670/bitdefender_mobile_security_antivirus_full_apk.pdf
    • https://s3.amazonaws.com/fuzafuzeruwit/lumojedojew.pdf
    • https://s3.amazonaws.com/zunaduxa/anno_2205_guide.pdf
    • https://s3.amazonaws.com/davolazupivowi/tojuxuletasojuzitagasi.pdf
    • https://static1.squarespace.com/static/5fc28126d49dd124473e558a/t/5fc6bc88c7c45a5eaf8e5ab8/1606859914276/pumateguzagolob.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_off0000bb2b.bin
60ddb73b8986d30b754417ea60c6bbd6f53cf67d71e686ed3bab2eaec3fecd76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2B 5512 bytes
font_01_sfnt_off0000cdcd.bin
b20468cf24a7dfd63f49c02274b5ed37fe9902e17cdd3557ff16214bfc3402dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCD 10340 bytes
font_02_sfnt_off0000f15f.bin
b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 16312 bytes

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