Malicious PDF — malware analysis report

Static analysis result for SHA-256 41673a5a5c0ff56b…

MALICIOUS

PDF

95.5 KB Created: 2021-04-06 06:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1b5dcf70760c729d1214b301a473f04c SHA-1: 526482317745429deb8dea093d431cca5e2e8366 SHA-256: 41673a5a5c0ff56ba7a78ebc2c6aafd45e1a3622c80ca48bc28e1f3c83a260f3
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9995

Heuristics 7

  • 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 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://nipisod.ru/wix?keyword=minty+code+generator+discord PDF link annotation
    • http://tobowajoveza.iblogger.org/koserinofawaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_60111b49172b2.pdfIn PDF document text
    • http://prizinsta.site/jetalb5e80.pdfIn PDF document text
    • https://wasitenatibasi.weebly.com/uploads/1/3/4/8/134890771/zawajed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_605d6b2f645f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_5fd5fa6789d5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374838/normal_600728f11e8bd.pdfIn PDF document text
    • http://vovpomnim.ru/mutants_and_masterminds_3e_character_builderl4hxk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477892/normal_6009baa46381b.pdfIn PDF document text
    • http://899themes-demo.ru/55540981494s7fxg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481402/normal_60546bf53f587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_601ce3ed2ef52.pdfIn PDF document text
    • http://xinupavob.iblogger.org/windows_defender_windows_8._1_free.pdfIn PDF document text
    • https://nirawulef.weebly.com/uploads/1/3/4/3/134324477/7374745.pdfIn PDF document text
    • http://samettemiz.xyz/bangla_day_today36lkj.pdfIn PDF document text
    • http://makamar.xyz/puvasadowomutikigemesut49fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_5fd712cca0c2d.pdfIn PDF document text
    • http://marafonsport.site/61946060889sttmn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bilitosepazilo.rf.gd/cambridge_advanced_practice_test.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 6588 bytes
SHA-256: b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831
font_01_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 5180 bytes
SHA-256: 75e3336c8bd82b11ce3bb1bc251c08316cb8905b417f1ba92a4aae84a299fe0a
font_02_sfnt_off00012514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12514 3388 bytes
SHA-256: 81d4cb93dfb5806726e2f382f5d3a7a24b33344952075fe04c034cbae1d2305b
font_03_sfnt_off000132c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C8 11004 bytes
SHA-256: 2e1b8ef3c72604317d41f1ed712dd6427b114193c06876b7461018011d9447d6
font_04_sfnt_off0001586d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1586D 16356 bytes
SHA-256: 20aa54a76171967c95a01118eab9c4df723f608536b9256e132745479fd7b3cd

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