Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8169bb76c7084aa…

MALICIOUS

PDF

76.4 KB Created: 2021-03-02 04:38:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 076f42227185731512e5a76c32ffaeef SHA-1: 4df69c6de001bcd3180dcc05f4f71960a92e6e94 SHA-256: c8169bb76c7084aaaa30b214c92010d311084852dcad33d12c2bf305b3499854
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan threat. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=lecturenotes+apk+free PDF link annotation
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/1879966.pdfIn PDF document text
    • https://forilulan.weebly.com/uploads/1/3/1/4/131408022/8889147.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/tikekelonuvaxap.pdfIn PDF document text
    • https://kimilofu.weebly.com/uploads/1/3/0/8/130873947/sikufiviroz.pdfIn PDF document text
    • https://sazebajamafogi.weebly.com/uploads/1/3/4/2/134265793/1035107.pdfIn PDF document text
    • http://simkosa.website/ap_chemistry_mole_conversion_worksheet0ln3g.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/hiJghih/really_funny_pictures_of_spongebob_memes.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/fiajb7q/2017_football_recruits_espn.pdfIn PDF document text
    • http://getliterate.online/55833411696jhvq4.pdfIn PDF document text
    • https://vudemigubujesi.weebly.com/uploads/1/3/5/3/135300151/dozenopejenezo.pdfIn PDF document text
    • https://cdn.sqhk.co/fimirexuf/dCih5fx/dragon_blaze_wiki_first_impact.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/bRUhg6T/82846746152.pdfIn PDF document text
    • https://rilulukopidu.weebly.com/uploads/1/3/5/3/135323077/gonepibemasisew-tepugoligim-bumikavetebov-fotura.pdfIn PDF document text
    • https://buderenedisam.weebly.com/uploads/1/3/5/3/135302361/ff497c5fad23724.pdfIn PDF document text
    • http://peuly.xyz/senokoxegujoxaxujazulbdaoq.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/vogama_nikab_nukeki_retuzojob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/ajax_form_post.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/post_obstructive_pneumonia_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/givonekov.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/74882586244.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_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 4980 bytes
SHA-256: ddf0f9bba86b5e1cb549df6e269aeefc571e29741751126d9e333afd379c0bb3
font_01_sfnt_off0001002c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002C 10540 bytes
SHA-256: 96cba223b2ff63a819af2ba0eadfd279a4b641b527b70407ad444d807e8637f4

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