Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d363a128fd5b6dc…

MALICIOUS

PDF

79.0 KB Created: 2021-05-01 04:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f82d170eaf783b1160ec00b72b7895e9 SHA-1: 28ce7b1fe72fd2eaceaf3e2d2716dbf85df0f12b SHA-256: 3d363a128fd5b6dce5ae4385e082a0116ab6368e0e954d8a6fb527206912e36e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, not typical user content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=dolores+cannon+conversations+with+nostradamus+vol+1+pdf PDF link annotation
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/6036024.pdfIn PDF document text
    • https://cdn.sqhk.co/sewenajete/ie8ShiN/81746499304.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/ec1360.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/benim_hocam_abt_edebiyat_ders_notlar.pdfIn PDF document text
    • https://cdn.sqhk.co/pibusupi/alRhbkp/benod.pdfIn PDF document text
    • https://cdn.sqhk.co/detokelixipi/cMbjf7G/sutobasu.pdfIn PDF document text
    • https://gikatufezido.weebly.com/uploads/1/3/4/3/134338368/182b36.pdfIn PDF document text
    • http://ponafutinuko.22web.org/ruratawawaforivudo.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/ijf5rns/17269338979.pdfIn PDF document text
    • http://puwonasomoso.22web.org/starbucks_in_china_case_study.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/372ade4.pdfIn PDF document text
    • http://wabiferofuvud.mygamesonline.org/python_2.7_set_methods.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/soriw.pdfIn PDF document text
    • https://lavowoluxep.weebly.com/uploads/1/3/5/3/135388351/9307401.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/tademuvejuwa.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
    • http://gegurobaz.myartsonline.com/assembler_directives_8086.pdfIn PDF document text
    • http://kabutusagop.rf.gd/caterpillar_annual_report.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DD 5480 bytes
SHA-256: 9549af1cce3bf2c8c03d7aede35fe78dbf9337889c72d7c2fecdf609429a966a
font_01_sfnt_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 1820 bytes
SHA-256: cfe7dcfa4a078a256f3971bef0c58835e76535ba0126e65f3bae9507ae2437e0
font_02_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 10236 bytes
SHA-256: 24549e845586d73972863af95162cb5b86dd0cc2f1907c1bb95d97bd9d0fedba
font_03_sfnt_off0001074d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 16480 bytes
SHA-256: 26be48b1a64ed5fda6aeb1a148265f4fe242597a9f1b53d7c1a3dbb39f87bfbe
font_04_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333