Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b442a53bb8a2a3d…

MALICIOUS

PDF

72.5 KB Created: 2021-02-15 00:16:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b00394af9895c4c88adee10950ecd976 SHA-1: 139cb90e565157f72399d519d40809c450adb45e SHA-256: 4b442a53bb8a2a3d80d50a680d460c7e5c228633a5c425f10de5f1eb318f942a
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 suspicious domains and are flagged as malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain text related to a sales listing, which serves as a lure to encourage users to click the malicious 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://crophysi.ru/123?utm_term=gi+joe+mobile+command+center+for+sale In PDF document text
    • https://static.s123-cdn-static.com/uploads/4390999/normal_5ff4dd1abc8cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415936/normal_5fc878be7f46e.pdfIn PDF document text
    • https://morogixifidogaj.weebly.com/uploads/1/3/4/4/134497599/debolikavimejok_xedeku.pdfIn PDF document text
    • https://judexesadizit.weebly.com/uploads/1/3/0/7/130738912/jebujixoto.pdfIn PDF document text
    • https://waweviruwupo.weebly.com/uploads/1/3/5/3/135311422/1917694.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422627/normal_6001bc1e86a78.pdfIn PDF document text
    • http://xojitufos.66ghz.com/jogewavirodevumiwukisola.pdfIn PDF document text
    • http://nudukuju.22web.org/timuruwumumafok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467306/normal_5fdea06c38c67.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/pidetenagifejibaxaluko.pdfIn PDF document text
    • https://nekamefirojes.weebly.com/uploads/1/3/0/7/130739169/91e60ad8f8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulipirakiran.rf.gd/letterhead_template_in_word.pdfIn PDF document text
    • http://sijurajogo.epizy.com/printed_faux_leather_fabric_sheets.pdfIn PDF document text
    • http://marilineme.epizy.com/rinuma.pdfIn PDF document text
    • http://nupawibufa.epizy.com/kasezorew.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/when_will_auchi_polytechnic_spat_form_expire.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_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 5416 bytes
SHA-256: 4a4668e6b79307a85650f569f25143049110d394e728b2471e83906c1f7a622b
font_01_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 11656 bytes
SHA-256: 2c46594b4c816c52e9984e2391921d727dbb379c5449a767ce504d92cecef828

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