Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b72883da33fe6df…

MALICIOUS

PDF

97.6 KB Created: 2021-03-13 15:07:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 173ebd4d988822793e2c02febf1916e0 SHA-1: 11194a3cdaa95d1319ca2104c458e3aaee80ab38 SHA-256: 8b72883da33fe6df8a1c22cde4f74a3bafe86956e5ff9aba90a1b5bf3fdc9f6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9992

Heuristics 5

  • 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 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://golowaki.ru/123?utm_term=chandamama+stories+in+telugu+pdf+free PDF link annotation
    • http://pusaburuku.22web.org/89639382459.pdfIn PDF document text
    • http://losinglotterynumbers.com/samsung_galaxy_note_4_charger_specsf4vzq.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/19898817341.pdfIn PDF document text
    • http://hugertely.xyz/nifitavilsrt37.pdfIn PDF document text
    • http://tersq.space/chamberlain_garage_door_opener_setup_wififlsg2.pdfIn PDF document text
    • http://repair-telefonov.ru/archero_apk_mod_money2tamo.pdfIn PDF document text
    • http://milano-moda.space/koxabojapibomujotunigaxftk00.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/18216517647.pdfIn PDF document text
    • http://tolunisusij.22web.org/6932369168.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://giwuvupajot.epizy.com/did_the_alienist_get_canceled.pdfIn PDF document text
    • http://guwaxilajoxeza.onlinewebshop.net/mevizibafo.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/nowirovazebir.pdfIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_1c2988c5e13341d38ddedcc084dd8ace.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_ead5cbd9b70a4a69950dd9cfde1aee00.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_499794cbd586499bbfc65a8817628206.pdf?index=trueIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_ff9c4d5343bd4642a3583b23f30db5c8.pdf?index=trueIn PDF document text
    • http://loxototo.epizy.com/edersheim_bible_history.pdfIn PDF document text
    • http://vepibali.rf.gd/49730281345.pdfIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_8808dffbd8d042ca95c17acb54b90b36.pdf?index=trueIn PDF document text
    • http://palelezugob.onlinewebshop.net/gleichnamige_brche_addieren_und_subtrahieren_bungen.pdfIn PDF document text
    • http://sovizurimi.rf.gd/ielts_essay_writing_samples_band_7.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 5360 bytes
SHA-256: bac4c7f8b8e4cf0a3eb3b88e0a079f4d0fcae91d9e7a6121d034608e7d22d336
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 41172 bytes
SHA-256: 7ddeb8587ae6bf5e3c6291c923fa61ff4ef1d197468e46dd94b4055200d7b163
font_02_sfnt_off0001461f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461F 10636 bytes
SHA-256: e5649da4603f63d861573a2e934b79d2f69608e6d86b4e2ffc1b7613331f527e
font_03_sfnt_off00016a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A94 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c