Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a311916f6ef4ca…

MALICIOUS

PDF

83.3 KB Created: 2021-04-21 20:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f55de9a33d00b7bd5ffe25412c582fd6 SHA-1: 585af44d0918b7e8d14763f8a326ecc799e13ff6 SHA-256: 96a311916f6ef4cae32949c4b2dbe180c0b87028adb9b1298fe74e5be5170dc9
186 Risk Score

Malware Insights

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

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 0.9990

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://bologen.ru/strik?utm_term=acer+chromebook+15+intel+celeron+n3060+review PDF link annotation
    • https://cdn.sqhk.co/kigezarokoji/TidhcPD/36751479159.pdfIn PDF document text
    • https://gidigodojuk.weebly.com/uploads/1/3/0/8/130874472/9745979.pdfIn PDF document text
    • https://gexuxufe.weebly.com/uploads/1/3/1/4/131406387/mamusufoj-kevulun-pufasinafinad.pdfIn PDF document text
    • https://dagolitufewanat.weebly.com/uploads/1/3/5/3/135345669/2310531.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/8660761.pdfIn PDF document text
    • https://mikixobitesa.weebly.com/uploads/1/3/0/7/130776626/ba5f602cc4cac2a.pdfIn PDF document text
    • https://jerupixudenaxi.weebly.com/uploads/1/3/1/4/131437293/cc6312d40.pdfIn PDF document text
    • https://gufekibeliwu.weebly.com/uploads/1/3/1/3/131382841/3885393.pdfIn PDF document text
    • http://kotonopiz.iblogger.org/sazibirabalonukepomiwufa.pdfIn PDF document text
    • https://cdn.sqhk.co/givujelised/hgjfsdI/83306473902.pdfIn PDF document text
    • https://cdn.sqhk.co/sirazisiluz/hiQhf1N/gunukapotagow.pdfIn PDF document text
    • http://lifupodez.22web.org/kikoxo.pdfIn PDF document text
    • https://sorizovebikup.weebly.com/uploads/1/3/5/3/135386894/a6f37fffd9b95d.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/vozogufaxi-tibaleloku-sogepa-rorel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_ec7f0e8d997a44079d5718f72ec57768.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_7e181a36788b4a9ab3a10ef7b7863e5c.pdf?index=trueIn PDF document text
    • http://tibojerevaf.rf.gd/18027966186.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_21c028ecfaeb46cab7e528d0a30b1c99.pdf?index=trueIn PDF document text
    • http://firixafuzive.rf.gd/lcm_and_hcf_worksheet_grade_7.pdfIn PDF document text
    • http://golofupatawef.epizy.com/hollow_knight_hornet_theme_piano_sheet_music.pdfIn PDF document text
    • http://kedipijelabilum.rf.gd/the_odd_couple_writer.pdfIn PDF document text
    • http://zisifotixevul.rf.gd/lightning_arrester_seminar.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_455f35f00d0046b9a7bbc544b7abedc5.pdf?index=trueIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_efe8644b4f8b47a5b8cc325e9d1f4814.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 3044 bytes
SHA-256: 0a4b5c31f4257e5a2707017370dcf829c84058060820f6748bf1d2aeb2c81f0e
font_01_sfnt_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 5632 bytes
SHA-256: 96a141dfee74fb0a87a1a7e6c5e285d16da1489c5578cc8cca500498fcd899a4
font_02_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 11436 bytes
SHA-256: 1955513825d7ebc40a7151a4cf97ca895f14fad041baba1d84b1b4d47b5e2d63