Malicious PDF — malware analysis report

Static analysis result for SHA-256 905d55030691a04e…

MALICIOUS

PDF

75.5 KB Created: 2021-01-13 14:35:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 58d4ef87fc977c30b1c05c9b8ee62ac5 SHA-1: 7ae74850bc2b71b7c29c491187f1a23ef1bdb989 SHA-256: 905d55030691a04e570a0aab5e1808e35a3ca30c320000806c3d4fd620d691b6
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO-based traffic redirection. While no scripts were explicitly extracted, the PDF structure itself facilitates the malicious link distribution.

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
  • 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/aws?utm_term=electronics+projects+list+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f8720e697482.pdfIn PDF document text
    • https://site-1174986.mozfiles.com/files/1174986/46567139296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420451/normal_5fb847097e27d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385026/normal_5f9f943b6bce2.pdfIn PDF document text
    • https://site-1176410.mozfiles.com/files/1176410/kaiser_permanente_washington_jobs_physician.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491725/normal_5fb6be0b16247.pdfIn PDF document text
    • https://bodupojuribun.weebly.com/uploads/1/3/4/7/134758420/nogijonomagit_panixexivir_vozipenejepozur_bugejomokinini.pdfIn PDF document text
    • https://moduruwili.weebly.com/uploads/1/3/2/7/132710657/91dba9d0348e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457590/normal_5fa6349545b26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462065/normal_5fc9f5ee52bc3.pdfIn PDF document text
    • https://golosoruxo.weebly.com/uploads/1/3/4/3/134339442/6cdb43a14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/john_wick_3_mp4_drive.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/gf_bf_dj_song_2016.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 4972 bytes
SHA-256: 6769cfda56d521c7fb8149b32c52bec9e11e317383924e374aa51bb6d20c8a69
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 10192 bytes
SHA-256: fdfec03525db872d5afb87b0df01ad4949c3500660db39d743e5e0f33359690f

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