Malicious PDF — malware analysis report

Static analysis result for SHA-256 1983a08df154b0f4…

MALICIOUS

PDF

74.3 KB Created: 2021-03-30 14:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f240e3f33043ec99e5e2cfb05e7682c4 SHA-1: e5a4e6a07d6f66220c4758b64dc84ad7fc5d686e SHA-256: 1983a08df154b0f4259814252e9fd3ff4aa10f197167bca4ab245ee24e32fa7d
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to potentially malicious redirector infrastructure or are part of a link farm designed to manipulate search engine results. The primary malicious URL identified is https://crophysi.ru/award?keyword=cancionero+de+la+rondalla+de+saltillo+letra+y+acordes+pdf.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=cancionero+de+la+rondalla+de+saltillo+letra+y+acordes+pdf In PDF document text
    • http://zijafanovidiz.sportsontheweb.net/beers_list_medications_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382784/normal_5fe4175d1415b.pdfIn PDF document text
    • http://xipevufizokev.iblogger.org/dimijasafexani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415768/normal_6035d0768b697.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460677/normal_5fe2b05b62c92.pdfIn PDF document text
    • http://silujokiz.mypressonline.com/74218748426.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/6057c7e3-8c1d-49c6-bb86-88a13ce09c73/hp_ultraslim_docking_station_audio_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab00079-df75-447e-9d75-703d52806307/78409629492.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_0b8850578c684773b8843374c03ac77e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/583062fd-5284-4867-8201-05ce92a15fae/6657489369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9023ac-0618-4640-8f4b-a678284e5601/27947518608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240afb41-01ad-4bcf-b32f-b26ee21d3201/perrys_chemical_engineering_handbook_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2edadf2c-6764-48fd-bed6-9316ea232678/sherlock_holmes_movie_download_in_hindi_480p_bolly4u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cfa8f6d-e55c-463c-a63a-37d623f7691e/57974499628.pdfIn PDF document text
    • http://xixakoju.rf.gd/fezajudediwoderalabuparat.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_207587102faa42cdab55178c329301e9.pdf?index=trueIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_93a9883eb8de4946b34a93e9d8bc2656.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dfbad18-3cae-4725-8c46-74001c61a8d4/ameritron_al-80b_instruction_manual.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_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 5156 bytes
SHA-256: e46fe21fc8992420d4a4dd0b1ae45605db3ab616fd563136a4018082d170f3ac
font_01_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 11936 bytes
SHA-256: 9608e702607f9ca2613fc7fb7c7116c38bf0b77205e9f300ca764219cf89279d