Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7461cdbddf5509e…

MALICIOUS

PDF

84.8 KB Created: 2020-12-30 14:23:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c9f09363f1a9ec938ee68ff9baaf1527 SHA-1: 01d6062c2f814e379945b8391d3a4787215fed0b SHA-256: a7461cdbddf5509ec198dd0835f58ea13ba61706da59214da0c144c5a9865efa
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffmen.ru/123?utm_term=sound+of+the+police+acapella In PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/luzegefa_gojubow_sosuw_zesetuguvuk.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/dakafib.pdfIn PDF document text
    • https://josodurug.weebly.com/uploads/1/3/5/3/135394296/7497fa53e4d1e.pdfIn PDF document text
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/63050485d541bc2.pdfIn PDF document text
    • https://xofeboje.weebly.com/uploads/1/3/4/5/134584890/burisubefi-bonenaranaxogi-pugamemonudovek-kikuwatixuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_5fd62fb8b5494.pdfIn PDF document text
    • https://legotukalijev.weebly.com/uploads/1/3/1/3/131380351/fuvoj_tixufufaku.pdfIn PDF document text
    • https://bobixazila.weebly.com/uploads/1/3/4/5/134599816/gubiv_xazekikopevovo.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/varexes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ad954a1e-4061-4288-b1c5-5fbeb5f81873/blog_de_libros_juveniles_para_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb33425-459f-411d-89df-4a8799d1c97a/33710149897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5160c7aa-9481-4f96-b2a2-bdf26ac371b8/buwulezaguva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a24adfb-b3df-48b7-9a94-9f43d42c659e/nubelofemelisefaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543c5258-d7cf-4ae4-aebb-a4907b1c617e/golf_battle_mod_apk_2020.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFA 6588 bytes
SHA-256: b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831
font_01_sfnt_off0000dd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 4956 bytes
SHA-256: 670d25054549ef2b5974de4f7a629dc1f8f1fd6291b4b6b3a543e3632bf8c59e
font_02_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 3268 bytes
SHA-256: 167cce252c18eb4ed3f65a1a3bf48dc3c194c4cd7308736aa4e4b1a161727f5a
font_03_sfnt_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 10588 bytes
SHA-256: a1547eb40770f5ef327bc462a19b25641312c3fa16bc5731e1eac42721fb9797
font_04_sfnt_off00011fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE3 16336 bytes
SHA-256: 12aba8d421747cc7b6f64e0779b2b7b17ec51a7e5f572de6077b2104e12ed3a4
font_05_sfnt_off00013566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13566 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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