Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c56a4f2a2bac11…

MALICIOUS

PDF

69.3 KB Created: 2021-03-08 00:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9ff7c7fbbbefcf082950cefee7a34f97 SHA-1: d0baf62406e740005a102ad310012fe6f4d01152 SHA-256: 22c56a4f2a2bac11d501fd0f81941aec17ed5c154d7eb9db80c1a5e22daa72df
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary URL pointing to a suspicious domain. While no scripts were extracted, the structure and numerous external links suggest the document is designed to lure users to other potentially malicious sites or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/wix?keyword=epever+mt50+manual+espa%25C3%25B1ol PDF link annotation
    • https://meliwuka.weebly.com/uploads/1/3/2/7/132740471/dudubifewinukitano.pdfIn PDF document text
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/bosux_zatafipadawemoj_zudabewop_wuradep.pdfIn PDF document text
    • http://jurexulekuw.22web.org/rixoniru.pdfIn PDF document text
    • https://todumubisopid.weebly.com/uploads/1/3/5/3/135312552/pevidutina-bidomasegez-funebijefodiwe.pdfIn PDF document text
    • http://potobol.22web.org/designation_in_registration_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/divexikav/kuwupibapimukejupofevugag.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/vinavebupagolev.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/41788023957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f96325-5d8c-4869-872f-42531977c0d5/hbs_730_battery_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/802d96b1-8364-4964-9589-c3e6a0eb9e02/zebojigijep.pdfIn PDF document text
    • http://kefegaruxofum.rf.gd/gexorure.pdfIn PDF document text
    • http://ladibemotivusam.epizy.com/jerokifajav.pdfIn PDF document text
    • http://dudufimapu.epizy.com/further_vs_farther_chicago_manual_of_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3abff1-8aa0-4152-936c-2769a55972a4/husqvarna_hu_725ex_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/58571193548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef5c76e5-13ac-4f43-8c8b-53d0f8debceb/how_to_fix_the_pilot_light_on_a_furnace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739f0d99-c1fd-402e-b332-6b0e0d95e1d7/nail_salon_open_at_8am_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1850083f-9309-46c5-b955-f041b4954605/el_hobbit_1_2_3.pdfIn PDF document text
    • http://wuxodevidupibe.epizy.com/melbourne_tv_guide_sbs.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/kuneler.pdfIn PDF document text
    • http://xowegitonazip.epizy.com/inflectional_and_derivational_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4127e25-65c2-429e-ad99-7d1acb5de891/vortech_mp40_positioning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15d9fe6-19c2-40dc-9272-dc008c023b1b/dilamidapuvuzujivapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/073b5933-c4dc-428a-b6a2-63888cdda625/pezuvijagaxesemuv.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E6 5460 bytes
SHA-256: 90312fd0a45bfe46e23573e50c53a4667aebcd50b24612cd12c113a2cd3b312b
font_01_sfnt_off0000e42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 9872 bytes
SHA-256: baeeef1452452a7c20871f7995778be72b16b553da3429dc586522d78d24d15a