Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3c31a777560142…

MALICIOUS

PDF

78.6 KB Created: 2021-03-09 14:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: be0d2536d3c3459a4a60e6bcbd493b0d SHA-1: fae22653ae434e2347aa73e5814028d6c2c7a201 SHA-256: 5e3c31a777560142cf3a2daed5d9c18720fa32d011a7c72d1102d8f4492f1a0f
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/aws?utm_term=charlie+and+the+chocolate+factory+full+movie+1971+english PDF link annotation
    • http://podeves.xyz/how_to_disable_bug_report_android5r1jl.pdfIn PDF document text
    • http://trastqort.online/sejikogibouphxs.pdfIn PDF document text
    • http://summer-italy.fun/dr_davy_dentist_st_maartenvax5g.pdfIn PDF document text
    • http://com-signto5.xyz/98564561274i1tlq.pdfIn PDF document text
    • http://raisinshq.pro/husky_pro_26_gallon_air_compressor_partsfn7m6.pdfIn PDF document text
    • http://fallofelin.online/probiotics_for_metformin_diarrheaer2lo.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://uploads.strikinglycdn.com/files/6cb5ce6d-efe4-420a-a72d-d5fa895e49db/zujekepivis.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_9139df73e055455ca3a600c704bd8dbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/086d5b0f-f437-4452-ab85-b8a497332688/epson_artisan_810_manual.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_d9ba3f5eb6654f1dbe43b34389615ef0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/285d2094-7c46-4d23-a617-d957d71254d5/thermo_king_reefer_parts_near_me.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_513ff946b8dc4eda9e0e42a79aacbe75.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zosevid/app_store_not_ing_apps_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/569dab78-99d8-4c8c-ad3e-6f0fdf95ab4b/hp_deskjet_2545_wireless_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/kolodilum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07baf8bb-bc13-4806-a918-66cd2e7a0038/how_to_install_graco_snugride_30_car_seat_base.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/49213132513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c292cdb-37bb-4201-a956-ccc6a18e5a65/39044584181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/121c4457-fa14-487b-a5e5-21933eae5229/41364711206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e55b9f9-94a1-4528-8023-22972077ffa9/5660088812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc7bacb-7909-4c83-9dfd-f427e8ffca4d/86719620151.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 5792 bytes
SHA-256: 1a1a0ce6da0f66dc89de7fb38b67051f9f0023f286f1556e2f6e9b815a646e55
font_01_sfnt_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 11884 bytes
SHA-256: 9078a49c10f1bcb3e146d78971a97483f14c8ab9067e1eb7f693c7a987b4ac83
font_02_sfnt_off00011e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3