Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b3a97325dba615…

MALICIOUS

PDF

76.5 KB Created: 2021-02-25 16:45:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 02f3dea0189b9229bba940e3d4ee4063 SHA-1: 22b28ff5d44878a89beabbe4efaaa993c254d735 SHA-256: d1b3a97325dba6153c7215dd70abc177f6398ef2aa4e797307da62abd3e4a6a1
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/strik?utm_term=dell+optiplex+960+weight In PDF document text
    • https://static.s123-cdn-static.com/uploads/4422894/normal_5fcc52f932fa1.pdfIn PDF document text
    • http://probnik1313.tech/doraemon_story_of_seasonstp3q1.pdfIn PDF document text
    • http://bogplaktnc.fun/how_to_change_schlage_door_lock_code47bnw.pdfIn PDF document text
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/829ac11cde7574.pdfIn PDF document text
    • https://wawodedirikib.weebly.com/uploads/1/3/5/3/135348651/xagedapo.pdfIn PDF document text
    • https://wiwamimojuwat.weebly.com/uploads/1/3/0/8/130813692/8d808d4a1f9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5fdd8011a8001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_600cc27b619d0.pdfIn PDF document text
    • http://sreview.online/dabumedomukadukedeiwtpm.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/zurovajij/15374785585.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/mulozatolegovawitaw.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/55508369751.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/kekosemoluduzadanivupe.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/nhs_insulin_pump_guidelines.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_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 5208 bytes
SHA-256: 4d40aae78e8a4564978f67190bae5017b7322e3f42b6d44ad11b33e31f99aac8
font_01_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 12644 bytes
SHA-256: 8390fb397d5bf27c253cd2281ca6c505c763d8323376a2e9aafa72c054b74c98

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