Malicious PDF — malware analysis report

Static analysis result for SHA-256 7469399a3d0783b6…

MALICIOUS

PDF

70.1 KB Created: 2021-03-05 20:06:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 35419c6dd55e9c9c9578bf35bed26592 SHA-1: 2941f0180caab1ce379c61196b7d3f6b0450aea8 SHA-256: 7469399a3d0783b636ea05b1b4ebe6359793b72bdb6f4fd546a64dc7fc0ddc1d
186 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The primary external URI, https://jumiwimov.ru/aws?utm_term=volume+of+cylinders+cones+and+spheres+worksheet+pdf, is likely part of this scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/aws?utm_term=volume+of+cylinders+cones+and+spheres+worksheet+pdf PDF link annotation
    • http://tejasatobes.medianewsonline.com/hp_stream_11-ak0000na_laptop_review.pdfIn PDF document text
    • http://teenagetutor.net/kozumazukalagozibijipebavkw18.pdfIn PDF document text
    • http://cashbackk.site/fojekal2tcv.pdfIn PDF document text
    • http://businesslinecenter.com/best_statistics_book_for_machine_learningu886v.pdfIn PDF document text
    • http://winoraama.site/2881269418970btd.pdfIn PDF document text
    • http://prizinsta24.online/16917539795j4pbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_82ad998ebc374dd8a542e19699088713.pdf?index=trueIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_e4bf85e87da3420a8d0c2e602f305d72.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_7ac9ebebf7654e86988e9168b5e6772f.pdf?index=trueIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/cx_ii_vs_cx_ii-t.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d009fc4f-1a53-4e09-b4a8-49a2370c05f1/tebozitejuvuxorojegidubu.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_c1e4539b7d73455d8a7da08de2162f38.pdf?index=trueIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_1f461e248cf540b7a22141be2afdb508.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b6fe53-95bb-41e0-8718-b4f5ef820541/panasonic_kx-dt343_manual_portugues.pdfIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_f507fb139c714546964c9cbf9aa3c852.pdf?index=trueIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/hitachi_c10fch2_change_blade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3a0a2f-c9a7-4d94-bf1d-6700704268a0/nubanovewederogopewad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9b46e1-af15-46fd-9080-f8b2c7bae494/que_hacer_en_la_ciudad_de_mexico_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de8ec0bb-1a6f-46e9-ace1-635d02878d32/oracle_12cr1_download_for_linux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38e14062-c996-42ef-9675-651a12950c8b/napivexuvagojedev.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_861000c7a6ab4099be67cca2f7119117.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cf45345-3b9f-4287-8f1f-a86285a7e778/what_are_the_10_korean_vowels.pdfIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_cd32883fa93a480c9c118b00ade5d605.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 5616 bytes
SHA-256: c79faa15ae148d3a2c5c7966489295c04f1936fdc05d9c6a9a9f2c1206d2e608
font_01_sfnt_off0000e745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 10248 bytes
SHA-256: 3aea3adb6c6b0e619311abbdd585afa6b9d862f3f3426f0e107dacad2fc43dfb