Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9fe6efe4d37db4…

MALICIOUS

PDF

74.7 KB Created: 2021-03-13 13:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 561763f22858766cdc2eb81900789155 SHA-1: 270b5b677860543264b522c2b9f25ecc281a6f29 SHA-256: cb9fe6efe4d37db42be466e61b498c1cbf8b39982ea4555ee122eaf56852a28e
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to a job description. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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 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://dafemum.ru/award?keyword=maintenance+technician+job+description+pdf In PDF document text
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/4030b971b028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_6018f3e98215e.pdfIn PDF document text
    • http://xilatotes.sportsontheweb.net/95718067875.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/what_is_the_difference_between_hemi_sync_and_holosync.pdfIn PDF document text
    • http://japebevavagufip.22web.org/ecriture_alphabet_arabe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497081/normal_6006b88042ab7.pdfIn PDF document text
    • http://rizovog.iblogger.org/4337274703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_5fda3d9545736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_603aaca7b9c97.pdfIn PDF document text
    • https://zikowetaxubof.weebly.com/uploads/1/3/4/0/134012945/jasodefavi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_7326d16d857f4e1cb1290914acf70a9c.pdf?index=trueIn PDF document text
    • http://kutavezof.epizy.com/74765808427.pdfIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_cc73f2dd91d64615a21099f8e6edb43a.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_7158de04b176450385f75c01a4b617ab.pdf?index=trueIn PDF document text
    • http://nosigegu.onlinewebshop.net/79575376975.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_1d6954c979004b23b27fcec57a309c80.pdf?index=trueIn PDF document text
    • http://valamujunitun.epizy.com/free_online_printable_calendar_templates.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_off0000e4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 5432 bytes
SHA-256: 8f1d8e99f434e9ec451eb280ac9e2c1d419c24a9972b8feb72cf75c24e23abe6
font_01_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 11292 bytes
SHA-256: 6af6e45381868f2d05c403b4232748be9824f5207ead3f06bf57aece9599ca03

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