Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f93c3448d40f0a…

MALICIOUS

PDF

74.4 KB Created: 2021-03-04 03:26:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ef1b648d1eefc7d1ee2c767f6045e1bf SHA-1: 413d9bf246470cffb7b674498cc197a46ae91482 SHA-256: e2f93c3448d40f0a4b6220b512522654f119ac3100ae6bb22f56d1cc90d1613c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The ML classifier also assigned a high probability of maliciousness. The document contains numerous embedded URLs pointing to disposable hosting and potentially malicious domains, suggesting a phishing or SEO spam campaign.

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://dafemum.ru/award?keyword=are+portable+air+conditioners+less+efficient+than+window+units In PDF document text
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/sisalonemadesuruju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_6013c6511227f.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/25555687868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473619/normal_5fd1cbeb2db71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_60210819470e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446158/normal_60277b88a5097.pdfIn PDF document text
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/sowedenizimev-vujijafejibal-tovekitixeke-nunukelojufurim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_601ee81fcb3bd.pdfIn PDF document text
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/juxobotelexito.pdfIn PDF document text
    • https://bobiguwifuza.weebly.com/uploads/1/3/5/9/135966914/dizulojitedukalekona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368984/normal_6028399769e35.pdfIn PDF document text
    • https://fejiwapofiji.weebly.com/uploads/1/3/4/6/134699364/rubuxikabej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_602d2457976d4.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/8097906.pdfIn PDF document text
    • http://idealslimitaly-official.site/criminal_law_1_notesa9wce.pdfIn PDF document text
    • https://vimixake.weebly.com/uploads/1/3/1/1/131164471/pujujaku_rewab_felopewupi_bofumuxorerab.pdfIn PDF document text
    • http://want-seo.ru/operations_management_by_william_j._stevenson_13th_edition_solutionslsgeh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 5464 bytes
SHA-256: 4c0924b9a31a8f6c24f35413d3410f58e82ceb7fff867dd8c9074cf233ebd89e
font_01_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 10208 bytes
SHA-256: 43d7df357f79336f24bef0a5ad11e563f2520cf64dbd84e04e76a63a83d80442

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