Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07739e657c35927…

MALICIOUS

PDF

80.5 KB Created: 2021-06-01 13:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 16b24e72ddbb0b4a35728ac2081831a1 SHA-1: 64a4fc0680f51d5d4b130a70dcc8fa73bb37ee92 SHA-256: b07739e657c35927a86e8b9b88765ac451b59404c5788991d8fe62836f88dbbc
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://philabc.ru/pbw?utm_term=assistir+filmes+online+principe+do+egito+dublado PDF link annotation
    • https://taninuto.weebly.com/uploads/1/3/4/6/134633468/1823856.pdfIn PDF document text
    • https://motadonikedubi.weebly.com/uploads/1/3/1/8/131856170/rabubimuwa.pdfIn PDF document text
    • https://kitorulefif.weebly.com/uploads/1/3/4/3/134331375/abb821c659b.pdfIn PDF document text
    • https://rixadoliwuri.weebly.com/uploads/1/3/1/4/131437780/4043583.pdfIn PDF document text
    • https://pizakatunif.weebly.com/uploads/1/3/1/8/131856177/pemitigasejo.pdfIn PDF document text
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/pujorukurakibe-fodoparujuwis.pdfIn PDF document text
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/lurifo_dutawixufosox_xetuw_musub.pdfIn PDF document text
    • https://kodopagedo.weebly.com/uploads/1/3/4/3/134350575/fajenam.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/8239bb2b-ca1d-45c6-b1d8-1551a096740d/tree_of_life_bible_verse_kjv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ffab59-fe33-44b3-9d35-0ab5ec0b2cd4/batalonov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d6e0d1-da23-4d16-b00f-695243b5f123/86863926600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f009dcd6-9461-4823-ab2c-5842adc6cdcc/fodesupesosewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a542c8-0ce2-4d55-8e22-b58f3ce6c109/rewoverikuxelulerutufos.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144421653/verbs_followed_by_ing_form_or_infinitive_exercise.pdfIn PDF document text
    • http://fevosezew.pbworks.com/w/file/fetch/144440013/xovolezodebaxekup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a800ad5d-3d74-45a0-aa2e-f4dc95e3858b/convert_sketchup_to_rhino_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8862b7b3-6e0a-40d5-ae34-e8bbe7e146fa/funciones_de_supervisora_de_ama_de_llaves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7253c7c-35bf-4366-afbb-03a6ea748b0d/how_to_connect_countertop_dishwasher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a49b0280-3784-458a-893f-1982c4ea4f8c/tafseer_tafheem_ul_quran_english.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/age_of_civilization_2_apk_free_download_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b24715-9990-4565-9346-fcb600de9bc4/how_much_does_it_cost_to_refill_a_sodastream_cylinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5772b15e-0ee4-4697-8c56-d41f0b04c30f/72883098371.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_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 5604 bytes
SHA-256: bcc65437036ab3220c94948d5f07b2b42dcfb19aae8ae5a554724295f6a1adb0
font_01_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 12660 bytes
SHA-256: 1196bb8a717713c65db880176e92c02e332d56a44a22ea71f92baf38eebf14c5