Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd03edc9e45587c…

MALICIOUS

PDF

77.2 KB Created: 2021-03-06 12:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5311acf1ebebae6538eef7750a16e1bb SHA-1: 78205117c455b602793af1427aa7d52ab0f87b80 SHA-256: 6bd03edc9e45587c0b03e20f016e2ab1ac478279aef57397f740173a0204dd05
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=soccernomics+pdf+portugu%25C3%25AAs
    • http://covid-19online.site/solaris_united_rank_up_reward3lenx.pdf
    • https://jozurukezareta.weebly.com/uploads/1/3/4/7/134741488/7072929.pdf
    • https://sitapiwagese.weebly.com/uploads/1/3/0/8/130814355/zadawib_dizij_luwazemuna_pimalibis.pdf
    • http://zhenskiizhurnal.ru/bharathi_kannamma_tamil_movie_hdpjou5.pdf
    • https://static.s123-cdn-static.com/uploads/4475208/normal_5fec5b4c207d7.pdf
    • https://tofudilasikota.weebly.com/uploads/1/3/0/9/130969343/gokopinurop-dazadisujizel.pdf
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/wibemiku.pdf
    • http://dawexefif.getenjoyment.net/five_love_languages_test_for_singles.pdf
    • https://static.s123-cdn-static.com/uploads/4409238/normal_60075a32d91a4.pdf
    • https://static.s123-cdn-static.com/uploads/4371524/normal_5fe31f78afdf8.pdf
    • http://sifisomatexow.sportsontheweb.net/whats_the_5th_harry_potter_book_called.pdf
    • http://agentsoft.space/wigoben6jkho.pdf
    • https://gurelupukuji.weebly.com/uploads/1/3/0/7/130775622/8d266.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zamemigojat/ccna_v6_chapter_10_answers.pdf
    • http://nivuzujanux.myartsonline.com/thermo_king_technician_salary.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_off0000f08b.bin
81bf6608c4a62c5ec541cfc6deea96d52730c1e03148985c5bd4201ad05a0f5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 5484 bytes
font_01_sfnt_off000102e4.bin
b9fcba5ede3eb952be7fcbea938bab7d7d6d90f9cf7a076facd5e3de9569df23
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 10328 bytes