Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b49a7a136f894b…

MALICIOUS

PDF

80.8 KB Created: 2021-06-03 21:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6c784de040f11d9c25815e8eafbb4556 SHA-1: 72b1de78d7bbf4dabc42088f7ab8934ed678e8d5 SHA-256: a0b49a7a136f894b6cf1868ffd3b908b742bc625363eba8eca3e97a69133a735
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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.
  • 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://nomylo.ru/pbw?utm_term=wortarten+bestimmen+%25C3%25BCbungen+pdf PDF link annotation
    • https://widetidutu.weebly.com/uploads/1/3/1/4/131453832/2300595.pdfIn PDF document text
    • https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/812af4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144419103/vagebaxixa.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/w/file/fetch/144534285/68230229793.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144417060/yearly_staff_schedule_template_excel.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/f/duromax_xp10000e_manual.pdfIn PDF document text
    • http://wenuveraroto.pbworks.com/w/file/fetch/144497904/76437199660.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144443664/nejifilejipudi.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144421050/64961686736.pdfIn PDF document text
    • http://zolunegoli.pbworks.com/w/file/fetch/144563004/4699919869.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/85280879877.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/f/wefepisidosu.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144564600/gafokagowus.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144487401/14683778799.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/w/file/fetch/144499425/xiweziwusijolezamo.pdfIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144424731/61667316542.pdfIn PDF document text
    • http://kirozatijawu.pbworks.com/f/ambilikannan_malayalam_album_mp3_songs_free_download.pdfIn PDF document text
    • http://tijigika.pbworks.com/w/file/fetch/144513297/20938818219.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144424110/how_to_stop_indesit_dryer_mid_cycle.pdfIn PDF document text
    • http://mavujeridolu.pbworks.com/f/43962620674.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144427794/wolole.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/w/file/fetch/144566988/can_you_be_treated_for_syphilis_while_pregnant.pdfIn PDF document text
    • http://zepupifob.pbworks.com/w/file/fetch/144426378/3-1_the_human_skeleton_worksheet_answers.pdfIn PDF document text
    • http://damopijos.pbworks.com/f/3560275977.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_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 5604 bytes
SHA-256: 17e846bdb2057c05562a9b160d6b84ff0450888055763cfa226248cd1dfe1378
font_01_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 11200 bytes
SHA-256: abddd5f5db718bb4666d2d0f98733a6aeebcde171c6b638be1a11794fea847d7
font_02_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15