Malicious PDF — malware analysis report

Static analysis result for SHA-256 4106066418f148b2…

MALICIOUS

PDF

90.9 KB Created: 2021-04-16 13:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cc9f1fd6c0ea79b966492b88a4382fe5 SHA-1: 25aa4693f66311f7d5d7b397faa9a6022f61ff1b SHA-256: 4106066418f148b25a7fe4085b11818ef2a38c5fac23f7eaefb076b1308c3a99
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this. No scripts were extracted, but the overall structure suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=presonus+studiolive+16.4+2+problems PDF link annotation
    • http://tupaxeguna.scienceontheweb.net/4640153433.pdfIn PDF document text
    • http://kazexezawulozij.mypressonline.com/los_arcanos_mayores_del_tarot.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/vejotowimabavikekut.pdfIn PDF document text
    • http://lixidepobejoji.mypressonline.com/59021191316.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/0a8407a0-9381-4a33-90ae-49a768bb3b70/kigavepapunosenawino.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/51545920160.pdfIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_56d356f53814473eadde7a4804b3968c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b07dd58c-41fa-4bb4-8815-757b9740a59d/how_to_make_a_logo_for_your_clothing_brand.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_6deb0dcdfc684f3ca3ed8815accf453b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/kuvak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2569829-3a62-4607-b7f7-72520dcadec2/las_edades_de_lulu_frases.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/how_to_train_your_dragon_3_trailer_2019.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_c816e6285583462b94843528825a6fbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd49c17-5b7e-4393-9881-ed65693e4c21/jimafafufawexazivode.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/pseudo_denys_l_aropagite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/462f7d67-f802-4ab9-91ce-0bf829a0ed2c/libro_de_geografa_cuarto_grado_2019_contestado.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/best_free_movie_sites_south_africa.pdfIn PDF document text
    • https://148d48ef-a78d-4e34-a4d2-755cfbac042a.filesusr.com/ugd/ccca9b_d8c3d1058501491b8ba70d8f06935f76.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/nazm_hikmet_kerem_gibi_iiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/447616df-635c-43ed-9d90-842cb5746504/88351595406.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_off0001251f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251F 5552 bytes
SHA-256: e38a9aee35f427b549da8ea36efa5fb71e515b905fb2eff26a075b4d98e91659
font_01_sfnt_off000137fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FE 11516 bytes
SHA-256: 4ab3472f7c22c37d83a15cd5cfe72aecd08d6668f268d745f17d151058ac94af