Malicious PDF — malware analysis report

Static analysis result for SHA-256 03abb18251566803…

MALICIOUS

PDF

79.3 KB Created: 2021-05-23 00:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f55bb9e8da03bf783e7b13302fc90f3f SHA-1: 50394d7572cebc117dbbcfa897fbe5747102bf79 SHA-256: 03abb18251566803dc4db8d1928081cb73040af57ccdee7c6b2ea3cd035abe00
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing operation. The embedded content, though obfuscated, appears to be related to physics, likely as a lure to disguise the malicious nature of the document. The primary IOC is the URL associated with the physics lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://dafemum.ru/strik?utm_term=11.s%25C4%25B1n%25C4%25B1f+fizik+newtonun+hareket+yasalar%25C4%25B1+konu+anlat%25C4%25B1m%25C4%25B1
    • https://cdn-cms.f-static.net/uploads/4446496/normal_601b6d7586148.pdf
    • https://dowanudamedi.weebly.com/uploads/1/3/1/3/131398164/1190752.pdf
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/pofobugone_womujonedatodex_saxisiruda_wuduzepur.pdf
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/kafufuvewikob.pdf
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5fdeffcf27436.pdf
    • https://bakasilamor.weebly.com/uploads/1/3/1/4/131407315/pakugixeperan.pdf
    • https://lozexisivebuzon.weebly.com/uploads/1/3/4/7/134702594/16c9301ec.pdf
    • https://cdn-cms.f-static.net/uploads/4420917/normal_5fd670253a37e.pdf
    • https://cdn-cms.f-static.net/uploads/4477183/normal_6017253163f9c.pdf
    • https://litusavetedi.weebly.com/uploads/1/3/4/4/134445261/fevuwux.pdf
    • https://vokavubibobudew.weebly.com/uploads/1/3/5/3/135316357/8327083.pdf
    • https://static.s123-cdn-static.com/uploads/4465151/normal_5fcf2c01dd1f9.pdf
    • https://static.s123-cdn-static.com/uploads/4420747/normal_5fec7a05f14b9.pdf
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fc75ccb5b9e2.pdf
    • https://fokomawirofuteb.weebly.com/uploads/1/3/0/9/130969657/a53c94.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jemazejodep/kumukutikutitap_choir_music_sheet.pdf
    • https://s3.amazonaws.com/temujonuwu/bama_livewire_ts_w_2_custom_tunes.pdf
    • https://s3.amazonaws.com/midizaxopazeji/tajigekigeto.pdf
    • https://s3.amazonaws.com/niporofez/akuntansi_sebagai_sistem_informasi_sma_ppt.pdf
    • https://s3.amazonaws.com/wovitiku/rote_counting_1_20_worksheets.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b6.bin
372120b66b3a5999de23d136262295b4568337c38d511c0b210d8a6100653323		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 5336 bytes
font_01_sfnt_off000107df.bin
c5066bed0939950c86f07ac38c827a1ba58ed819912e49d9b1f6c7a56b86cd0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 10932 bytes

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