Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7e1664e96dc219…

MALICIOUS

PDF

74.0 KB Created: 2021-02-21 03:38:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4082edf8e7df1dfcac1d523484eb4938 SHA-1: b5a77fc51eb2b2d5ab87fbc28b598c646ca5b2bc SHA-256: 9b7e1664e96dc21969c3c418a158a3de922f731b9dc7937828a4541cd3a1631e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to attacker-controlled infrastructure.

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
  • 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://baarspo.ru/wix?keyword=primary+dns+suffix+of+this+computer+server+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382638/normal_600654f335752.pdfIn PDF document text
    • https://jokikisiva.weebly.com/uploads/1/3/0/8/130873994/semasutawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370996/normal_5fc8fbaabd188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471988/normal_5fe6e9dac96bf.pdfIn PDF document text
    • https://xukunuwemixul.weebly.com/uploads/1/3/1/3/131384589/sulapujujasegog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498348/normal_601eb8e4bb113.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403816/normal_5fca54a69dffc.pdfIn PDF document text
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/gerivifadu-rasazubijixatu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384046/normal_5fcf4a79af800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_602791847cb45.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/bNjajic/larobebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_600f3de581375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473403/normal_5fe7a0c97d80b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479691/normal_5fd637396f44e.pdfIn PDF document text
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/8452214.pdfIn PDF document text
    • https://community.spiceIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mokixetat/kung_fu_panda_2_full_movie_download_in_hindi_hd_filmywap.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_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 6076 bytes
SHA-256: a986d54bb24ac796055fa35d2f7513a95bd0c22230c2112c04b91584324fa58f
font_01_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 10272 bytes
SHA-256: bb8f19db6b779eb199ab2c345489b2f8e6360f6530535b25d014b26f1d0ac38c

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