Malicious PDF — malware analysis report

Static analysis result for SHA-256 7485593d2e5d3fef…

MALICIOUS

PDF

72.0 KB Created: 2020-11-17 05:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f5ba3f2a3b70f88516a5e420a1e5bd9f SHA-1: 1842dd36226c44faf043ca473ca70b8fd93ffbb5 SHA-256: 7485593d2e5d3fef7ac89f592189bcf735be2722f5774a7cbc59643f54b72490
214 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating it is a phishing or trojan delivery mechanism. It contains a large number of embedded links, forming a link farm, with the primary redirector URL being https://traffmen.ru/strik?utm_term=log+sheet+for+work+hours. The document's content, though heavily obfuscated, suggests a lure related to work hours, likely to trick users into visiting malicious sites.

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=log+sheet+for+work+hours In PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fafec81b994b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5fa758117ef19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_5f924e02c0589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_5f921003b7dac.pdfIn PDF document text
    • https://rutukesusejam.weebly.com/uploads/1/3/4/4/134464581/7929329.pdfIn PDF document text
    • https://vufufibujirefe.weebly.com/uploads/1/3/4/3/134355905/7699467.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/1d386b894e7568d.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/fexazuvogajokover.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_5f8f9392ada01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5f8cc5a51d0f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5fa4009f1e584.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/sazixipame/15635569593.pdfIn PDF document text
    • https://s3.amazonaws.com/mupakijivuruzim/one_way_anova_vs_unpaired_t_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba4208f-a4ea-47e3-ab02-3e5598d24736/kovovewerefepa.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/fender_frontman_25r_red_tolex.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/authenticator_microsoft_android.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_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 4884 bytes
SHA-256: 1d0d78d55dd8ec39934928e40228b6e1b1852956777b407b001815ace58a49bf
font_01_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 10164 bytes
SHA-256: fcaf6a4c7ccc6e38c5e3d05fe14c0870bddea66cb2f4fc0fc09595fdce99bb7f

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