Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2abd953dd0bb05…

MALICIOUS

PDF

73.7 KB Created: 2020-12-27 23:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c79723920c9fcbbd9e37865514f6d52b SHA-1: 8d7fb23e0e1251eac66556c4e08deeb138f5325b SHA-256: 8f2abd953dd0bb0506b09f3986d89fd5a53c04c5a6772a83acf09357c41dc88f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ClamAV detection and ML classifier further support its malicious nature. The primary attack pattern involves luring users to external, potentially malicious, websites through these links.

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://traffmen.ru/strik?utm_term=3526+herons+circle+reno+nv In PDF document text
    • https://cdn-cms.f-static.net/uploads/4482645/normal_5faace6fadde7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_5fa4ba2d3c2dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_5f9e804188614.pdfIn PDF document text
    • https://madaleva.weebly.com/uploads/1/3/4/7/134772198/mazugebivez.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/igdi7gf/nelunoxofidozosop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_5f943ca7c00c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417305/normal_5fb3626c6803f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380086/normal_5fc481bf42bf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_5f9d499f5141a.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://s3.amazonaws.com/dazutun/android_phones_under_15000_in_nepal.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/fractions_and_percentages_of_amounts_worksheet_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/41563247962.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/sports_gifts_coupon.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/75869348800.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 4924 bytes
SHA-256: 4178dab68b492f383aaecccd01cf12b085e7c95dc70be850dd8ae6b025356adf
font_01_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 11268 bytes
SHA-256: 9b026d425b42be5aaac6474ceb7fef586be00874e5654c1569205ea82c11bdd8
font_02_sfnt_off00010be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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