Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b2a481fdb4cf6e…

MALICIOUS

PDF

72.0 KB Created: 2020-12-19 00:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 299fd701e8272f1ebf0804b52275d2b0 SHA-1: be7615ce6bfd9970468a3d465ac61f77c877b6d7 SHA-256: 91b2a481fdb4cf6e7da7ee23e99bd4b8fd732483d47d331bc69ef98b4234bdfa
214 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector (traffking.ru). The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and link farm suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffking.ru/aws?utm_term=common+interview+questions+and+answers+nz In PDF document text
    • https://nifazupu.weebly.com/uploads/1/3/4/5/134507595/3412220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452618/normal_5fa393b1c068b.pdfIn PDF document text
    • https://wunanowadile.weebly.com/uploads/1/3/4/6/134600652/5821804.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/4892254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383147/normal_5f90de456f0f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5fd3d26dd65ef.pdfIn PDF document text
    • https://tuxipowu.weebly.com/uploads/1/3/4/6/134699968/ffac3b6d69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414487/normal_5fa48f59dea74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458616/normal_5fbdcc4b46bed.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/palikuvexake/gw2_class_guide_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59bf5534-40a0-469f-82bb-056c5b90429c/8741076918.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/chaffoteaux_maury_elexia_ii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21cddbdc-ea3d-411b-976d-a43d0f709803/94888296927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38259089-0373-47a7-9e05-618fc516b201/solution_manual_for_heat_transfer_holman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b12ed7-460b-4665-a798-e35b2ba07848/dirt_bike_hitch_carrier_aluminum.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_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 5172 bytes
SHA-256: 97233f1049dd3fead26bed71399fbec200f40dd849d355391d290f388ce55ada
font_01_sfnt_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 10480 bytes
SHA-256: e4e702a963348f90a73877c21dfc2147b4ab511531b1e2b8c9e03bcabe4e5928

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