Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee8242981f26cdc…

MALICIOUS

PDF

78.6 KB Created: 2021-03-21 06:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ff9b8bcb42c0adb6f14ddb3053facfb7 SHA-1: 2feaf051264a0878ae4076a01d6933186b64d8b2 SHA-256: 8ee8242981f26cdc858075198acf77083d0fa6b4bfa21936c4e597eb669e0b5b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of link farms on disposable hosting, reinforcing the phishing lure interpretation. No scripts were extracted, but the presence of many external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=evenflo+chase+plus PDF link annotation
    • http://flipping-car.online/super_mario_land_2_dx_gameboy_colorb3z0b.pdfIn PDF document text
    • http://zajilakofudo.scienceontheweb.net/dokijasufizanegoziwokiba.pdfIn PDF document text
    • http://globalsafegroup.com/xesuzugeresatureserexinab4h4u0.pdfIn PDF document text
    • https://ritesevegozuvij.weebly.com/uploads/1/3/1/6/131606822/d50d24305059.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/752616345810vk8k.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/57671418897.pdfIn PDF document text
    • http://letxxnx.org/bonivoxivekunaspcdb.pdfIn PDF document text
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/fatomesemiwodij.pdfIn PDF document text
    • http://excschool.ru/72481560485wuphx.pdfIn PDF document text
    • http://probkin34.xyz/2021_learn_calligraphy_big_horizontal_happy_plannerrh789.pdfIn PDF document text
    • http://dressnbuy.com/irobot_roomba_i3_3550_reviewjwbpt.pdfIn PDF document text
    • https://tixuxawopor.weebly.com/uploads/1/3/0/7/130738504/kazapakijofejabe.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/bloons_monkey_city_music_downloadqjzo3.pdfIn PDF document text
    • http://meetsalon.xyz/naspghan_constipation_guidelines_2014m2y5x.pdfIn PDF document text
    • http://trokot-roznica.xyz/molopejokodatipolemztel3.pdfIn PDF document text
    • http://contact-git.top/typewriter_restoration_houstonvdz6b.pdfIn PDF document text
    • http://cashtanks.fun/integration_of_cotx.cosec_xrrayn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_7be0a292b86f4be39a5e33e529cf8fbf.pdf?index=trueIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_7543fd054ae14aea8df3d80b4d1dc3d3.pdf?index=trueIn PDF document text
    • http://zijedan.atwebpages.com/xebazofenuwigamitipo.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off0000e14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 5024 bytes
SHA-256: 95a3e7dcc6439a439493097ffb2a9dfabdf5ef84f95bb55602ca975b6c532ccc
font_02_sfnt_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 10620 bytes
SHA-256: 8983cdbcac1783b7765332c9f3d4d9dfd5a3099ea0a6bf177a7af846cf35d79a
font_03_sfnt_off000116e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E0 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940