Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa9cd3f7879ae94…

MALICIOUS

PDF

111.1 KB Created: 2021-02-11 09:08:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b3beaed578b3b43ca9387d5931d64a0d SHA-1: 3f8500938cc5b4fa4393e2c7c05c8699819bf682 SHA-256: 5aa9cd3f7879ae9411cbfa2e89877ef6504c104a88b63a38b05e718c0c14a1dd
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM, indicating a strong likelihood of phishing or malicious redirection. The ML classifier also flagged the document with high confidence. While no scripts were directly extracted, the embedded URLs and the nature of the heuristics suggest an attempt to direct users to malicious content, potentially for credential harvesting or malware delivery.

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://crophysi.ru/wb?keyword=abipones%20informacion%20para%20ni%C3%B1os In PDF document text
    • https://static.s123-cdn-static.com/uploads/4417827/normal_5ffe638846b57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446016/normal_5fcd1a784b928.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/euhJJgj/16981002215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_60143e0b50326.pdfIn PDF document text
    • https://dalegoronatodul.weebly.com/uploads/1/3/4/3/134309481/d498d6ebc31e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_5fd3030d3c838.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/dizezekeruzaro_dakopikika_sanuba_kerikudik.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/ihjfHje/snow_white_and_the_huntsman_sequel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redowana.epizy.com/mudaje.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/wow_jaina_boss_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/gutimixokiw.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/fewozulotulinopifugoloje.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/google_sheets_custom_function_range.pdfIn PDF document text
    • http://vovajixavago.epizy.com/genetics_crossword_puzzle_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/8874162959.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_off000175e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175E8 5468 bytes
SHA-256: c388e5957a5c398799d2de29026d702576312a6c5eab60c916d4ba848ecf52b2
font_01_sfnt_off00018829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18829 11384 bytes
SHA-256: ad02bb6cbe061d3ff2df5cccce857fca2e062ea7119e0f961d69c8d221a295a6

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