Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c1041bcfbc0b35…

MALICIOUS

PDF

83.2 KB Created: 2021-03-25 09:58:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cd048840b109c2ca913f69f3ad44d563 SHA-1: 70e0664c0de3b6dddf5c8bda5e3b991abaec09d1 SHA-256: b7c1041bcfbc0b35902a7d5e893d2506aabced0fd083ba6dadc4513b95279677
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 0.9994

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://jottigo.ru/wix?keyword=worx+wg155+manual PDF link annotation
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/5761192.pdfIn PDF document text
    • https://sasanufodokedu.weebly.com/uploads/1/3/0/9/130969760/1714319.pdfIn PDF document text
    • http://feviziwomuta.iblogger.org/adivina_quien_soy_esta_noche.pdfIn PDF document text
    • http://medgaj.com/rilagalawofawaroxagafz0kn.pdfIn PDF document text
    • http://mevatupumave.22web.org/o_level_math_past_papers.pdfIn PDF document text
    • http://mx50off.pro/52975762250l065c.pdfIn PDF document text
    • http://drenajkrasnodar.ru/95551792504cdp4j.pdfIn PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/9683560.pdfIn PDF document text
    • http://ukranews.site/keyboard_shortcut_move_between_sheets_excelw19of.pdfIn PDF document text
    • https://koxidofajutu.weebly.com/uploads/1/3/5/9/135971573/fevefejofexod_puzur_mekufiwa_fozidepopit.pdfIn PDF document text
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/3097956.pdfIn PDF document text
    • http://kekebol.iblogger.org/58531435707.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/seriposuj/diccionario_de_americanismos_gratis.pdfIn PDF document text
    • http://gefubuforuz.epizy.com/odisha_election_result_2020_download.pdfIn PDF document text
    • http://tunawumananedi.rf.gd/87864404620.pdfIn PDF document text
    • http://gukewaxubi.epizy.com/vifupopijobezeseb.pdfIn PDF document text
    • http://batareguso.epizy.com/mosekuzaxejagove.pdfIn PDF document text
    • http://laletanegimiw.epizy.com/febusadokalepawageba.pdfIn PDF document text
    • http://nomekerileme.epizy.com/evil_morty_theme_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/hallelujah_song_by_alexander.pdfIn PDF document text
    • http://fekugijofexoz.epizy.com/coran_en_franais.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/new_bodo_video_hd_2019.pdfIn PDF document text
    • http://xamijofut.rf.gd/ninimubumalaganunebobum.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 5176 bytes
SHA-256: 38b75777d700f4532b52e5003fd2e5176488c1d92aa40e563051da9a2c852383
font_01_sfnt_off00011670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11670 11812 bytes
SHA-256: 45f75b31eeda5803b868deb3c4623273fe1d36022c7894608c5586278128ca2d

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