Malicious PDF — malware analysis report

Static analysis result for SHA-256 492cc6a3ace6a9b6…

MALICIOUS

PDF

88.9 KB Created: 2021-03-15 10:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a037c007ab6f5ac72dbd5d90448c157 SHA-1: e90e9b6bea6640cc6051402a79ee227ecff158aa SHA-256: 492cc6a3ace6a9b6374f551e9dfcdc8f06e11941e046d0935c6853517e0ed0a4
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to application letters, further supporting a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=example+of+application+letter+pdf
    • http://poxumanavofeboz.scienceontheweb.net/node_js_referenceerror_document_is_not_defined.pdf
    • https://cdn.sqhk.co/xejulonejo/VmVihb5/mobile_auto_electrician_melbourne.pdf
    • http://italywow.info/27129609629qg1rr.pdf
    • https://static.s123-cdn-static.com/uploads/4368227/normal_5fe5d3ef104a9.pdf
    • https://static.s123-cdn-static.com/uploads/4465024/normal_5fe475d62f164.pdf
    • http://nikaold.site/cantos_para_el_domingo_de_ramos_2019riek9.pdf
    • https://cdn.sqhk.co/nujekezitifi/TJG62ib/gatijegikisoxuf.pdf
    • http://vigastlens.xyz/15357102134pjw3h.pdf
    • https://cdn.sqhk.co/kigimole/YjiHhT1/dekinigidezopawol.pdf
    • http://vobalemujumojak.mywebcommunity.org/econometrics_for_dummies_roberto_pedace.pdf
    • https://cdn-cms.f-static.net/uploads/4369141/normal_6013917bd6add.pdf
    • http://detonic-de.website/stihl_011_avt_carburetor_rebuildwkm6a.pdf
    • http://sepozimog.scienceontheweb.net/gifekazotubodujixatapupug.pdf
    • http://carbags.site/36496861569ggb6c.pdf
    • https://static.s123-cdn-static.com/uploads/4490754/normal_5fdf20d68b97d.pdf
    • http://zugapuvu.mywebcommunity.org/the_idiot_elif_batuman_review.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_ed7f9e9b5fac478fb95eb025c69582ff.pdf?index=true
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_4cf88577ed9541d1bed7c7b9f0f00de5.pdf?index=true
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_14b44c1442a14ff4bae68ae65615990a.pdf?index=true
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_4a9c13f80b174697a4be5075147d0be6.pdf?index=true
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_167efd9d3a5b45b1a233cd8d8af34e36.pdf?index=true
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_0d14d71f0a464daea2862a41295ed441.pdf?index=true
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_ff0914d6dd8d4db7b2566a1c7a8c3345.pdf?index=true
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_8a8cc63597804d97a3e82d1bd5f2e791.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105d8.bin
72a86a7bc0236866a670dc0a6618b3af834e84ad335a31a0cb1fb43c0977a7a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 5148 bytes
font_01_sfnt_off0001174c.bin
cff7b6cdae470b6f376ab7fc55d3049d9da62abbf09a43341f99fedf74c621a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1174C 10668 bytes
font_02_sfnt_off00013bcc.bin
748f78af5ca2b41a5b54f176e7cdfd101105d940b6e86b50311a0a5b6ff3dfe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCC 17536 bytes

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