Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f9a1cadd7055b3…

MALICIOUS

PDF

75.3 KB Created: 2021-02-19 06:20:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ec2faf500d42ac3e95e027c76cd4b48c SHA-1: b065fd5fcb0663e9390599f8a38b15b08a5b854f SHA-256: 57f9a1cadd7055b3d52b258a14695dc47e66cfca29a8a1934cffc8d2f1cbde97
244 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to disposable hosting services and potentially malicious redirectors. Heuristics indicate a link farm designed for SEO manipulation or to distribute malware. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan.

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://crophysi.ru/strik?utm_term=how+would+you+describe+a+ice+storm In PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/5172245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492275/normal_600103f59d24f.pdfIn PDF document text
    • http://profyhouse.ru/761233948116ht16.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/b5f7ed.pdfIn PDF document text
    • http://lishop.site/84020588490f8d9w.pdfIn PDF document text
    • https://rukifutotusiz.weebly.com/uploads/1/3/4/6/134685592/5515916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_6024656804e62.pdfIn PDF document text
    • https://wawodedirikib.weebly.com/uploads/1/3/5/3/135348651/xagedapo.pdfIn PDF document text
    • https://raxiruzaxulam.weebly.com/uploads/1/3/0/7/130738564/4026236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_5fe83829bed34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dotemewu.epizy.com/manually_uninstall_adobe_creative_cloud_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/fozad.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_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 5380 bytes
SHA-256: 67d40d4e1135fc18df3ec4d0875a14ee0713d1dc3bcab0be76d9c7359dd2398a
font_01_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 11336 bytes
SHA-256: b1c2d3a0263abd786ed4b0f4533ad6c0e1808bb795f01ff899c047e18cb97e6c

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