Malicious PDF — malware analysis report

Static analysis result for SHA-256 82264a3705b738bf…

MALICIOUS

PDF

85.3 KB Created: 2021-04-06 14:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2a0f50dfc34c0f6241d420ae81f09244 SHA-1: db7a55cb704db226388e91783d9e6c265eba4295 SHA-256: 82264a3705b738bf51fd416dd732bb0b0317c895d67ac62f9e69732b5cea5d24
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 0.9995

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/123?utm_term=better+informed+giving PDF link annotation
    • https://kofuremejekesor.weebly.com/uploads/1/3/4/2/134235353/4d861f2d8ec3.pdfIn PDF document text
    • https://femesizexib.weebly.com/uploads/1/3/4/0/134018571/vokojuzozajaro.pdfIn PDF document text
    • https://patawera.weebly.com/uploads/1/3/4/1/134131312/nuxalari_fapajubofotik_zilaxuti_xizupolimitedud.pdfIn PDF document text
    • https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/5320787.pdfIn PDF document text
    • https://wudufedowuton.weebly.com/uploads/1/3/2/8/132815791/lakusisemi_rifogefev_wezolagonosezol_fosatekekuxosu.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/e1066.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/dfd2a662-5e80-482a-8e01-1c75d9200674/sebexopurupu.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_87f422903a8e411fb6445f7b10931258.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/306b526b-243c-4e99-9e0b-f6bd720b9a0a/conflict_management_definition_business.pdfIn PDF document text
    • https://9cc03a5b-da86-4a44-8f3d-15f7580f9586.filesusr.com/ugd/cac91c_1fed5b403f624a2689f39d2b4249dfeb.pdf?index=trueIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_5e58ceb3b05a4367bef2a8a8683a4aee.pdf?index=trueIn PDF document text
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_3f70388f86744f7f8f365f7d08d3feb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/31897208224.pdfIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_4037f71c0f10441fad7f5ae92870512d.pdf?index=trueIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_1f6252491c1948d4b7562520e410709a.pdf?index=trueIn PDF document text
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_985e176bf2a24f3592b2d0386d7bd531.pdf?index=trueIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_7975e2eccdbe48029c7f52e5101a49fb.pdf?index=trueIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_5619d98262f548abb5b1b39e2ea69c5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/wotimaxipibovufojixoda.pdfIn PDF document text
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_e39b46d7c9e94cbda268ec84f902dbc8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donarepemi/birthday_gift_certificate_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f714754-d068-44ea-b7a2-9ccb10803fa0/the_mortal_instruments_city_of_bones_full_movie_reviews.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_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 4704 bytes
SHA-256: 74cd27179e2b7c80f4902860c8aaebd4db6e213c7d17f4b615b7eba3a6fcd471
font_01_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 11680 bytes
SHA-256: 5735b70e732bdfcc596cdee763daf24d78f099cba28aba5b764e74b3e275b5be
font_02_sfnt_off00013839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13839 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3