Malicious PDF — malware analysis report

Static analysis result for SHA-256 5990e065a87bc655…

MALICIOUS

PDF

76.1 KB Created: 2021-05-30 20:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 609c2fbc22d4d3961705519cc75063c0 SHA-1: c6dd940be3dffc435dd4d0da28094bb165229ac9 SHA-256: 5990e065a87bc6558b114094da1462e0ce7331b9d469c6752c390d114d24128a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/123?utm_term=answer+me+songfacts PDF link annotation
    • https://gojefofowuf.weebly.com/uploads/1/3/4/5/134596001/xorebofuwulipin.pdfIn PDF document text
    • https://foxekefiki.weebly.com/uploads/1/3/4/6/134666392/zunifi.pdfIn PDF document text
    • https://lojodisomu.weebly.com/uploads/1/3/4/0/134042672/9861123.pdfIn PDF document text
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/tipimumosapi_momimudo_vuxapil.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/rawuvapigeg-vujalitukimav-zonug-baxefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412195/normal_5fda57896f3d7.pdfIn PDF document text
    • https://renevemepo.weebly.com/uploads/1/3/1/6/131606397/7602699.pdfIn PDF document text
    • https://nutovavodus.weebly.com/uploads/1/3/4/0/134012609/fb3e1ca9361cfbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_601cdc2c25a87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473340/normal_6018d929d06f3.pdfIn PDF document text
    • https://mabudorowux.weebly.com/uploads/1/3/4/4/134458492/a27a455d21d3e9.pdfIn PDF document text
    • https://xolopebowuraj.weebly.com/uploads/1/3/4/6/134600193/manijefogewazu.pdfIn PDF document text
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/nirakevotajo.pdfIn PDF document text
    • https://bisomimimuj.weebly.com/uploads/1/3/4/5/134526732/7752580.pdfIn PDF document text
    • https://rokumipizo.weebly.com/uploads/1/3/0/7/130776068/fagibagukusuna.pdfIn PDF document text
    • https://sajipetifejej.weebly.com/uploads/1/3/4/8/134883768/0e7b6eb1747d.pdfIn PDF document text
    • https://bumenabizobopum.weebly.com/uploads/1/3/4/4/134462968/8e926159ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_603b53b1c3aff.pdfIn PDF document text
    • https://razitesewiwi.weebly.com/uploads/1/3/2/8/132815022/3244193.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451566/normal_5fe53ab2f1082.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e4a5736-78c3-418d-ad85-cd49a07de37e/ha_ho_gayi_galti_mujhse_song_download_djjohal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96bfebd2-99cd-4340-8b32-f0c4a5f333ce/26957668124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb5b8f06-82ab-4d97-a852-a66d1e861f82/gomiruxuwojovi.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_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 5252 bytes
SHA-256: 513397b6b898c2a97cdb27c8229f3bb655f4e1f9e99b69467d5114c885d23bb2
font_01_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 11520 bytes
SHA-256: beb8c3389a61f141ab2bd25c288f9a5e65ecc4365b71db16df106839bcce5bf1