Malicious PDF — malware analysis report

Static analysis result for SHA-256 899b93e45c301a51…

MALICIOUS

PDF

69.0 KB Created: 2021-03-22 08:27:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 73c3ea7fe515f14e4acf1e7cdf792c88 SHA-1: 4893acb72d300f77e44d4289db6053fcac246ffd SHA-256: 899b93e45c301a51af19eb154836e4ee0b6b8e91ec8b415b94400238b4665fc5
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though partially corrupted, includes a title related to job functions, likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://mezovuduw.ru/wix?keyword=formato+de+manual+de+funciones+por+cargo PDF link annotation
    • http://wajazenizur.mywebcommunity.org/90712288170.pdfIn PDF document text
    • http://wegaturagifo.getenjoyment.net/sekaxirubox.pdfIn PDF document text
    • https://liguputuked.weebly.com/uploads/1/3/4/5/134501996/5fdf81863f.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/sozujegupesafiguwed.pdfIn PDF document text
    • https://ruwijupoxotafan.weebly.com/uploads/1/3/0/8/130814308/rumubomemuzot.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/70407913747.pdfIn PDF document text
    • https://tizizuner.weebly.com/uploads/1/3/1/8/131872037/97dad3.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/442c1ae2-0338-46a8-9986-7068a7a92020/rimoniriv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d412ea-c97c-45a1-b7e1-e008d0715b40/tezoduwedemazagadinasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e4c47c-4bf9-4027-acec-3bf2ae6b381a/vinagre_blanco_sirve_para_bajar_de_peso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8428d4-fff9-4ca0-9cbb-4ce19dc311f1/animal_farm_character_name_symbolism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d96554-3dae-4a53-8e69-c677713c4b4d/14396263778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46fba452-c27a-430f-a144-deca9841aa47/the_innovators_dna_harvard_business_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/tijotujixenotogule.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/canva_premium_apk_for_android.pdfIn PDF document text
    • http://tifalupu.rf.gd/tijozuzef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9825a615-ed30-4869-9805-1c2875411156/how_to_know_if_you_have_a_boil_or_pimple.pdfIn PDF document text
    • http://kusababi.onlinewebshop.net/95459934790.pdfIn PDF document text
    • http://tixefol.epizy.com/what_is_a_short_summary_of_the_fault_in_our_stars.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_off0000d47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47C 5432 bytes
SHA-256: c0878e70b530386c4443b5a0661f2c105d1c444e4e90ff02e5c07217338d715c
font_01_sfnt_off0000e6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 9812 bytes
SHA-256: 814c36596c187dd084bfa6973db54bbe665a80ff986726c24d038729b8902204