Malicious PDF — malware analysis report

Static analysis result for SHA-256 abef5e0454a087ad…

MALICIOUS

PDF

76.1 KB Created: 2021-03-08 00:14:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0f9151f534846906f470001852b70e62 SHA-1: 563439d49077d1929cceb0a4886caa6e9898f006 SHA-256: abef5e0454a087ad8280b7d657b4d22b043948a6bc4dee602ca6e5914b5c65e1
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/aws?utm_term=do+tomatoes+grow+all+year PDF link annotation
    • https://nirasiban.weebly.com/uploads/1/3/4/3/134344158/3805249.pdfIn PDF document text
    • https://merebidoso.weebly.com/uploads/1/3/4/3/134344951/f25cef.pdfIn PDF document text
    • http://vavesojijakoju.iblogger.org/accessible_parking_permit_application_form.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/68578789072.pdfIn PDF document text
    • https://zulevoto.weebly.com/uploads/1/3/2/6/132696122/88a248c.pdfIn PDF document text
    • http://damomemisogadex.iblogger.org/duwir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemunedipu.rf.gd/bhandara_district_map.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_cf9f39ca916e4bc888c8ad3dde69f064.pdf?index=trueIn PDF document text
    • http://lamafuravufezin.epizy.com/nutrition_care_process_and_model_part_i_the_2008_update.pdfIn PDF document text
    • http://batuzotunar.rf.gd/49493407326.pdfIn PDF document text
    • http://satuzolo.epizy.com/lepolokisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/259677f9-0be7-43dd-8fda-c4ef7cb571e0/who_moved_my_cheese_case_study.pdfIn PDF document text
    • http://dunoxoxuri.epizy.com/add_and_subtract_worksheets_first_grade.pdfIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_48b6ea0aa85f4e728ec668f71b8ed92a.pdf?index=trueIn PDF document text
    • http://paxokebarunune.rf.gd/benaam_ajay_devgan_movie.pdfIn PDF document text
    • http://pipomutazujem.rf.gd/77649734209.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_7d7e4ee3e6604e0887bd8c552ae9150d.pdf?index=trueIn PDF document text
    • http://zavinawotomuvef.epizy.com/medimapetalopuzukajel.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_1c6c789750834ece880efd322b986268.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_6ea63be9e7914116b82257f7d81a7ae1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae09e87e-c925-4345-be4b-48923d9ea616/81563077169.pdfIn PDF document text
    • http://gabinosemepof.epizy.com/20707276648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbfdce71-ec8d-415a-aae7-aabcfd42925d/occupational_outlook_handbook_is_updated_every.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b260377-8898-4ecb-a187-5472559ee7ac/lolizebuxusexad.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_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 5200 bytes
SHA-256: f88b5156f5793c2416f6b882b03b88997f8603677f1a141b61a3c25b0b7580f3
font_01_sfnt_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 11208 bytes
SHA-256: 593d3a52d4c5b39ad1feb1e8c18afe3934f2fb4993671d8b40eadba3b5e971fe