Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a877a11965a169b…

MALICIOUS

PDF

97.9 KB Created: 2021-02-15 19:02:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d229d2b41b9b434fc11c6297b37c2f8a SHA-1: d56aaa8a7a03f15c56cc557dcdfd720abfd94aa1 SHA-256: 4a877a11965a169b43c1e33e9211c14a5683a4b4898358042e702637223c7190
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. It contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The embedded URL and the numerous external links suggest an attempt to direct users to potentially malicious content or to influence search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/strik?utm_term=what+are+the+economic+lesson+from+asian+tigers PDF link annotation
    • https://lokudepapina.weebly.com/uploads/1/3/5/3/135325929/93caa3070061.pdfIn PDF document text
    • https://neletataw.weebly.com/uploads/1/3/1/3/131398134/firepeza.pdfIn PDF document text
    • https://malosopiwa.weebly.com/uploads/1/3/2/6/132695478/5086672.pdfIn PDF document text
    • https://gemiporelowagi.weebly.com/uploads/1/3/0/7/130775846/rikulo-koputa-jamojepavok-tofimawigeri.pdfIn PDF document text
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/jikimaxenarugegu.pdfIn PDF document text
    • http://guwodela.iblogger.org/jingle_bells_music_sheet_with_notes.pdfIn PDF document text
    • https://vozokeku.weebly.com/uploads/1/3/1/8/131857213/minupukinimib.pdfIn PDF document text
    • https://jinonapipi.weebly.com/uploads/1/3/4/4/134481743/2727593.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/047a98c40b.pdfIn PDF document text
    • https://nudesobaxoxis.weebly.com/uploads/1/3/4/6/134666739/705b89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://gavojomizam.epizy.com/my_aged_care_assessment_manual_march_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/zazapinapiwewa.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/transfer_letter_template_format.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 5352 bytes
SHA-256: 85877ecc8540d61a4114db3decd2e95370ab430e9eb58a5c6e3edf5d43501b69
font_01_sfnt_off00012f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F24 5308 bytes
SHA-256: 23d2a8b606fa82db06aee2090293704cd228e7c1a0f0f7aab502447a1d1e6ac0
font_02_sfnt_off00014115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14115 4380 bytes
SHA-256: 5b7cfd012d648ac33342a4a37f379afe6b92284107607b9f9b0020ebde885973
font_03_sfnt_off000150f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F5 12540 bytes
SHA-256: c9b5ca28fcbb16af48c9fab52ff55cb76101fe469c8a55a9de989e0c2c08bf56

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