Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0755cef62c10d7…

MALICIOUS

PDF

70.8 KB Created: 2021-02-16 04:21:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 182370a5e482f49b0a35387778a8394c SHA-1: 1b9a1216c004b9c2d14d0a3ff4b9ac0931ffd6ab SHA-256: 4f0755cef62c10d7c3f63e6618d95b54aec21e51f07165c3d67d9d3bc9b2e567
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://maypoin.ru/wix?keyword=quantum+theory+worksheet', is presented as a worksheet, likely to attract unsuspecting users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://maypoin.ru/wix?keyword=quantum+theory+worksheet PDF link annotation
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/balabuveronedip-tutidenupo.pdfIn PDF document text
    • https://kabenodetaxixum.weebly.com/uploads/1/3/4/7/134754863/f08c71ce6dc39.pdfIn PDF document text
    • https://sefokuto.weebly.com/uploads/1/3/0/7/130738721/xevax-kobamuwodo.pdfIn PDF document text
    • https://kodiridit.weebly.com/uploads/1/3/5/3/135342100/kodavenin.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/pubiwoliri.pdfIn PDF document text
    • https://pajarozexukonom.weebly.com/uploads/1/3/1/4/131437235/xojomajimiwokas_wenipowunavigi_pakuve_level.pdfIn PDF document text
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/wixijuxon-fexiwi-vozenikemopiv-wozumifovuf.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/jcJhjia/tiliwisug.pdfIn PDF document text
    • https://watilokid.weebly.com/uploads/1/3/1/8/131856522/8fc77b51cfcba.pdfIn PDF document text
    • https://zomafada.weebly.com/uploads/1/3/4/7/134772300/b214753332.pdfIn PDF document text
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/sokonojuj_ziwubosene.pdfIn PDF document text
    • https://zasosefudasu.weebly.com/uploads/1/3/1/8/131856937/66ea6b2.pdfIn PDF document text
    • https://satefavazavapof.weebly.com/uploads/1/3/4/7/134718375/86e4cbab48e7.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/nakekizamoxixitudunu.pdfIn PDF document text
    • https://tineminelebon.weebly.com/uploads/1/3/1/6/131606156/1657368.pdfIn PDF document text
    • https://polokoxukoneg.weebly.com/uploads/1/3/2/8/132816042/db57c3400ae23a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/donake/cf_moto_800_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/54744787892.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB710 5048 bytes
SHA-256: 6377d818261f4bfddd2985890af6a342f20f56c449010786e342dbc3ef1bb2dd
font_01_sfnt_off0000c819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC819 10192 bytes
SHA-256: ffaea5e2b7ca54d150c22596ac20f0e1032f5cb7c10d6c7c7bca14cf7968bcee
font_02_sfnt_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 16112 bytes
SHA-256: 23e5e0a6ad5360bf10628433507e5aab34c42d7d900ccb2a5214949f2168b422
font_03_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333