Malicious PDF — malware analysis report

Static analysis result for SHA-256 f588c9bcdacba73f…

MALICIOUS

PDF

94.2 KB Created: 2021-03-24 07:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dd41dae5fef5e93d3e938078c118c40 SHA-1: 7392637235a8520b4c6d2a3d8b8a9499c303affe SHA-256: f588c9bcdacba73f2be149e87ff4c5280b537c65d0dba8960b82a704f2a6a661
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution attempt, likely using embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=sql+server+2016+standard++iso
    • https://static.s123-cdn-static.com/uploads/4417658/normal_60097dec47a97.pdf
    • https://buvawaxeve.weebly.com/uploads/1/3/0/8/130874113/neduz.pdf
    • https://static.s123-cdn-static.com/uploads/4412573/normal_5ffbf4ff43b7e.pdf
    • https://static.s123-cdn-static.com/uploads/4470553/normal_5ff15dc2763a2.pdf
    • https://rirumuzog.weebly.com/uploads/1/3/4/1/134109041/remozoxub-bafejanifefi-tiputetimes-lirotilez.pdf
    • https://cdn-cms.f-static.net/uploads/4375702/normal_600a047d31070.pdf
    • https://static.s123-cdn-static.com/uploads/4366947/normal_5feb16b5cec2d.pdf
    • https://cdn-cms.f-static.net/uploads/4382772/normal_603239be8c9c5.pdf
    • https://static.s123-cdn-static.com/uploads/4418579/normal_5fe061cfc53c7.pdf
    • https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/zopod.pdf
    • https://zisinifaja.weebly.com/uploads/1/3/4/5/134599776/wodemopesemaloboniru.pdf
    • https://cdn-cms.f-static.net/uploads/4381551/normal_604abc2f4aad6.pdf
    • https://doliwalesi.weebly.com/uploads/1/3/0/7/130776147/lanolowob-futizusaz-relegodubivoxij.pdf
    • https://cdn-cms.f-static.net/uploads/4365539/normal_60556e8faa31a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sojaxub/par_quoi_remplacer_le_beurre_darachide.pdf
    • https://s3.amazonaws.com/zafirawit/ks3_maths_multiplying_decimals_worksheets.pdf
    • https://s3.amazonaws.com/gomakobez/54230332654.pdf
    • https://s3.amazonaws.com/dazawojob/94562008726.pdf
    • https://s3.amazonaws.com/taguxif/zafajavufinume.pdf
    • https://s3.amazonaws.com/gafedupeba/52813698928.pdf
    • http://lolowavedipugis.rf.gd/76365205754.pdf
    • http://tugosujamas.rf.gd/descargar_musica_de_los_tucanes_de_tijuana_el_tucanazo.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_off0001309a.bin
b1f825cdb7964e6ce9190760661af66c33606bd4f74bfd1b6f3ddcb808e8c0e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1309A 5588 bytes
font_01_sfnt_off000143b9.bin
96ee7807485accba76f5c33ee2117813c325bebd98774e15f1f82288641d959b
pdf-font-stream PDF embedded font (sfnt) at offset 0x143B9 11656 bytes