Malicious PDF — malware analysis report

Static analysis result for SHA-256 133fd32dd6c00738…

MALICIOUS

PDF

82.3 KB Created: 2021-05-04 18:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 314c42f6f7988b01064eb4d8a56cfc6f SHA-1: ead6ae2e9c2f3467178e8d3cc5a11cbfa7b90791 SHA-256: 133fd32dd6c00738406ce8ba23a8027ab6370bde7adcd5501cb45fb9799eef26
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, as indicated by the PDF_SEO_LINK_FARM heuristic. One prominent URL, 'https://jacksth.ru/strik?utm_term=harry+potter+5+movie', suggests a lure related to movie downloads. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jacksth.ru/strik?utm_term=harry+potter+5+movie
    • https://cdn-cms.f-static.net/uploads/4383923/normal_60525588af5a4.pdf
    • https://betamomaj.weebly.com/uploads/1/3/2/6/132695924/8221031f9.pdf
    • https://static.s123-cdn-static.com/uploads/4455914/normal_5ff04459111aa.pdf
    • https://cdn-cms.f-static.net/uploads/4481058/normal_60122c5a29709.pdf
    • https://cdn-cms.f-static.net/uploads/4459468/normal_6021941a545c8.pdf
    • https://cdn-cms.f-static.net/uploads/4484635/normal_6016d4644d944.pdf
    • https://static.s123-cdn-static.com/uploads/4460688/normal_5fee3e02214de.pdf
    • https://cdn-cms.f-static.net/uploads/4406775/normal_606d94dfa1e12.pdf
    • https://cdn-cms.f-static.net/uploads/4454691/normal_6050579edf7d5.pdf
    • http://rubewox.sportsontheweb.net/85835460147.pdf
    • https://cdn-cms.f-static.net/uploads/4372696/normal_603ba47735dbd.pdf
    • http://pugisapi.mypressonline.com/jalapev.pdf
    • https://kidudowo.weebly.com/uploads/1/3/4/3/134318554/d78f8.pdf
    • https://cdn-cms.f-static.net/uploads/4417531/normal_6013a3ce1c15f.pdf
    • https://cdn-cms.f-static.net/uploads/4481527/normal_6041adba77228.pdf
    • https://cdn-cms.f-static.net/uploads/4476270/normal_5fe8338dabe03.pdf
    • http://jerugujekema.getenjoyment.net/jupokoz.pdf
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/4423191.pdf
    • https://darefosal.weebly.com/uploads/1/3/4/6/134601331/68fbdd0b9b0.pdf
    • https://vorarixumo.weebly.com/uploads/1/3/4/4/134490966/54ca4e7.pdf
    • https://cdn-cms.f-static.net/uploads/4374368/normal_601189a59ee11.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bcc1228f-092c-4c9f-bd95-9efdf83be45f/secret_game_movie_2018_bollywood_download.pdf
    • https://uploads.strikinglycdn.com/files/7b3b287e-5cd5-41e3-9bcf-1beb97e3a131/calories_in_1_sonic_onion_ring.pdf
    • https://uploads.strikinglycdn.com/files/4e2a6a8c-052f-4d99-bb7a-06e23437aae6/how_to_use_stanley_staple_gun_with_nails.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f991.bin
56694d87bbb1822f7ea8ac2a1f2039e24e3fc08752e9d0f41dafaaabe54fd85d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 4684 bytes
font_01_sfnt_off00010989.bin
115e3b38f4cbfbb06a05290bf81e16ba8352fd6f1cc51a8816fe770144d851a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 10488 bytes
font_02_sfnt_off00012d8f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8F 4324 bytes