Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b0bd0dab9d93cc…

MALICIOUS

PDF

90.9 KB Created: 2021-03-23 23:46:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 72630f262342a6e68e895dfe7a305c7d SHA-1: 410207edc3932bde318976125f6cb21767b05168 SHA-256: 22b0bd0dab9d93cc8818434083541725e4c921182d28c3982da3f418d92bbb78
176 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to phishing sites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a malicious intent to drive traffic to potentially harmful destinations. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://xezojetit.ru/wix?keyword=1.3+trigonometric+functions+answers PDF link annotation
    • https://cdn.sqhk.co/gabadifofibo/gfDhckS/furreal_friends_gogo.pdfIn PDF document text
    • https://talokawibameze.weebly.com/uploads/1/3/4/0/134000376/4394106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_6039f91d37139.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/KVgiJic/4979523172.pdfIn PDF document text
    • https://muvanuxeb.weebly.com/uploads/1/3/4/0/134096654/dedetusekiledirurabu.pdfIn PDF document text
    • https://gixopujo.weebly.com/uploads/1/3/0/7/130775076/kofoxetadebij-zurebakotivu-latudefu-zisut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496602/normal_5feb61d382743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465252/normal_6055746393f7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418000/normal_5fdfc251b8945.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/SieoLBx/sandeep_maheshwari_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/d0ieh5i/american_outlaw_off_road_wheels.pdfIn PDF document text
    • https://korexabareruwa.weebly.com/uploads/1/3/2/6/132680962/8610700.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/hdheRyx/88788321476.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb6786e-8ff7-424c-9767-683c20172735/rubugabezetomemaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbcab7f1-9c90-498f-a53d-65eba54fc28a/nipisemoriribidisotunisa.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/bon_voyage_charlie_brown.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/52840170613.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/ion_ilp_turntable_needle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e93655-f79a-4919-a891-82af2b3eb9c2/is_motorola_surfboard_sb6121_compatible_with_comcast.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/tofaturepimuwogugawuxonus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24d8099-f011-4119-9bf3-cb319bdea3af/best_solvent_for_recrystallization_of_acetanilide.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/gajog.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/gunukanofabuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc5b4d7-ecd3-4833-b6f0-882b616b9885/what_diet_is_good_for_clear_skin.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/klasifikasi_tanaman_anting-_anting.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 5416 bytes
SHA-256: 4373e8e1af2827e40e9c76e0e3b35fbee9e1c5cbf50be85e01750d992b30b09e
font_01_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 12652 bytes
SHA-256: 334a64c9a0b0694fdf8bbd9bce51cfc875efba46a407cf0cc9d71d32294a4d1f
font_02_sfnt_off00014920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14920 16096 bytes
SHA-256: b1012f06963c2aaa138b1a1b41ce61e53326fc85a5cb8e4a569fc08fe8587a25