Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a53f7d11c07ae1…

MALICIOUS

PDF

103.7 KB Created: 2021-01-17 14:08:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 397570a8abc1678b17d369cbf70fe344 SHA-1: 7ff7e85d7e64ceae2d51674d22c84c647f22d613 SHA-256: 14a53f7d11c07ae1906132b1f794e93bbfa00fc4bae33e2671c380e32b02702e
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting or known redirectors, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection, likely to a phishing site or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffmen.ru/aws?utm_term=annotation+problem+in+bioinformatics In PDF document text
    • https://xetazegutim.weebly.com/uploads/1/3/4/7/134747192/5893326.pdfIn PDF document text
    • https://jolidezebixisu.weebly.com/uploads/1/3/3/9/133997790/13f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451551/normal_5fbc90c3f386d.pdfIn PDF document text
    • https://sabitafev.weebly.com/uploads/1/3/4/3/134308069/tosufetetusezaz.pdfIn PDF document text
    • https://sepijoverik.weebly.com/uploads/1/3/4/3/134317252/826689ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485580/normal_60017c79448aa.pdfIn PDF document text
    • http://mofizikozi.22web.org/blouse_cutting_tamil_video_free.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/8002864.pdfIn PDF document text
    • http://petajofap.22web.org/wumovevamik.pdfIn PDF document text
    • http://fuwefepor.iblogger.org/gajumepimip.pdfIn PDF document text
    • https://site-1176998.mozfiles.com/files/1176998/lizewemalavunuki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370074/normal_5fc8637a00bd9.pdfIn PDF document text
    • https://site-1174531.mozfiles.com/files/1174531/44845859798.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedokonox.rf.gd/jaguar_i_pace_charging_guide.pdfIn PDF document text
    • http://rovuritag.rf.gd/supilololevixafopelejudop.pdfIn PDF document text
    • http://vekoxoke.epizy.com/97240762056.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D41 5288 bytes
SHA-256: d571338fea0d5ed77c55fff5c7c0d7fd21718b9cb26f10d6abe0dec738fd03f5
font_01_sfnt_off00014f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F28 12460 bytes
SHA-256: 2230692c08c2980ce15305e2c1b6f51cada47ff9540f74a745c223c57a26c7cd
font_02_sfnt_off0001795b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1795B 16824 bytes
SHA-256: 42e95361f587c8d2358bf788101e948647504eb6a7dd17a740cda8bdc07f676b

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