Malicious PDF — malware analysis report

Static analysis result for SHA-256 63037618831c9210…

MALICIOUS

PDF

95.7 KB Created: 2021-02-11 14:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 78a541b8bdd896e44f8d84b100a20ac9 SHA-1: dc99d76f85d1fec1af6851d433a4cbf3247d3aa5 SHA-256: 63037618831c92103f09f3de3c5aaa82b926ae623021d98f9c4342d335f51267
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The document's content is misleading, using a search term related to educational material to disguise its true purpose. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/aws?utm_term=clinical+pharmacy+mcqs+with+answers+pdf PDF link annotation
    • http://danivufulof.iblogger.org/moradog.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/hdiehgl/fairy_tail_high_school_musical_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/fiiSbvr/bkash_apk_old_version.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/rapejifuzetiti.pdfIn PDF document text
    • https://foxujutuz.weebly.com/uploads/1/3/4/3/134348357/e29a6c.pdfIn PDF document text
    • http://nelitip.22web.org/godabafovilenuji.pdfIn PDF document text
    • https://nudadisaxoge.weebly.com/uploads/1/3/4/0/134018155/7457f427a09efc.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/ekihgeP/jiwewipojo.pdfIn PDF document text
    • https://cdn.sqhk.co/tulotunofuz/hbIfgfB/no_man_s_sky_xbox_series_x.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/GIhdheT/52020431029.pdfIn PDF document text
    • https://nofiluwovix.weebly.com/uploads/1/3/0/7/130739726/zeluzesedelamexu.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/vUdjbGE/tefajekekawinuziwip.pdfIn PDF document text
    • https://gunosevibo.weebly.com/uploads/1/3/4/7/134716368/fuxurupozasid.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/qHV2iiM/takeletaludelagone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miwufojo.epizy.com/28956966839.pdfIn PDF document text
    • http://wexejobi.rf.gd/33369512416.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/blocks_world_apk.pdfIn PDF document text
    • http://ketolunumakomez.rf.gd/chacha_bhatija_full_movie_1977.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/pilates_exercises_at_home.pdfIn PDF document text
    • http://lenomona.rf.gd/xamarin_android_emulator_mac.pdfIn PDF document text
    • http://luxogigir.rf.gd/2018_dse_econ_paper_1_answer.pdfIn PDF document text
    • http://tiwebukesa.epizy.com/abcd_movie_in_tamil_in_tamilrockers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014078.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14078 27392 bytes
SHA-256: 0da0f9790986e2297c68d4551948c013d30f6c340f05da70039d6e6b597f465d
font_00_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 3560 bytes
SHA-256: b4b3a931ede7bd380749723094f47ad6b9124f2a8c91ddb12b66e9c80cb6aee1
font_01_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 5620 bytes
SHA-256: 7ad79d41895cc979bbcd6c92abe7563abdc7834f52c19c180b753da0d75b515f
font_02_sfnt_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 13692 bytes
SHA-256: 717c541eb59c933528d652288dabc4562e25ab9a10041ae020e6689e460be4f4