Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6b459a6bc38594…

MALICIOUS

PDF

127.8 KB Created: 2021-03-19 10:35:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 268696ef71c11c2617476eefa70ddfb3 SHA-1: 52ee2ffd1cfec5821403baceafbbb0fe05eaacd9 SHA-256: 6e6b459a6bc385944a4ebc69efb599a7e6e24f20adf29ef315a9e755f9f66a65
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 0.9988

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://nipisod.ru/wix?keyword=reyna+avila+ramirez+arellano+age PDF link annotation
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdfIn PDF document text
    • https://bovuxugiz.weebly.com/uploads/1/3/4/9/134901291/vunosipemuwifedowone.pdfIn PDF document text
    • https://bawobejeburojax.weebly.com/uploads/1/3/1/1/131163695/360b147004570d.pdfIn PDF document text
    • https://nodirodenesubob.weebly.com/uploads/1/3/5/9/135986245/85b0c722660.pdfIn PDF document text
    • http://gawexapovozetep.iblogger.org/pioneer_mixtrax_avh-4100nex_reset.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/woXggij/40571717266.pdfIn PDF document text
    • http://linoveda.22web.org/thermal_insulation_sheet_material.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/db9948e3f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd3ab62f-54ca-4f74-a2ac-bf0455085cc3/subfinder_esd_123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a9d2830-5c02-411e-a311-9de6ebb14929/how_to_tune_husqvarna_chainsaw_carburetor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1cc500a-3759-4f73-aebc-0b28cdab27c6/84874084667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6348c914-a5f1-4ac0-9294-c5b4702fc172/68657085517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c2ac935-2710-41ce-b571-55e41d46844b/2001_chevy_s10_transmission_fluid_type.pdfIn PDF document text
    • http://sotilijiminariw.rf.gd/tutidejilosuloviligaxuwef.pdfIn PDF document text
    • http://pukuwatisapejo.rf.gd/84828402578.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/sokoju.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/touhou_all_star_mugen.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/what_is_measurement_in_research_design.pdfIn PDF document text
    • http://galiwasik.rf.gd/2020_calendar_printable_uk.pdfIn PDF document text
    • http://gugevifuvonavir.epizy.com/folubozaxaxi.pdfIn PDF document text
    • http://vidarixek.rf.gd/muvosoxigejofoxorozodu.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/12307794259.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_off00018e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E5B 2940 bytes
SHA-256: bd03c3a7e2639bb091cc82074d3beda5b4909b448bd07ca36d1a2b12256358ca
font_01_sfnt_off000198da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198DA 5048 bytes
SHA-256: 5cc96eb7a5d4f402683dca8040e97cdb7c249edef77645b64215f576aaaa07c0
font_02_sfnt_off0001aa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA05 2244 bytes
SHA-256: 3eccb973d47a159dead1e8ba6ca991706f15ee1d63fe7496a3fc2d8d3018ede5
font_03_sfnt_off0001b42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B42D 11024 bytes
SHA-256: 3f0bd8a653aa98b435345005650b6308d03e5073750fe11e0b7b8e2091d552bd
font_04_sfnt_off0001da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA07 16164 bytes
SHA-256: b99f3422495d7000f36add31b3ea8bcefcdd5e5fae1582619ff78f5357176837