Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0ff06215426a64…

MALICIOUS

PDF

76.3 KB Created: 2021-06-09 17:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f59e1aad3cb9bbd26a119281ba0e50b1 SHA-1: d67aa880963fb1af33e133607e627f52f951c32b SHA-256: 7b0ff06215426a64544f8efd55a009e8cbcd1e1820381fff667ba22caf45ba26
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://wastran.ru/pbw?utm_term=carrom+game+hack', suggests a lure for potentially malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the sheer volume of outbound links points towards a distribution or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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://wastran.ru/pbw?utm_term=carrom+game+hack
    • https://cdn-cms.f-static.net/uploads/4448991/normal_60100e34a038d.pdf
    • https://static.s123-cdn-static.com/uploads/4368493/normal_5fca6d3d2c7c6.pdf
    • https://static.s123-cdn-static.com/uploads/4414161/normal_5ff2563de5c19.pdf
    • https://cdn-cms.f-static.net/uploads/4421036/normal_60462681cc3c9.pdf
    • https://tipepopodotojo.weebly.com/uploads/1/3/4/6/134636352/3988679.pdf
    • https://nekejoravumow.weebly.com/uploads/1/3/4/3/134355852/6403597.pdf
    • https://cdn-cms.f-static.net/uploads/4375087/normal_603bfbb3f1998.pdf
    • https://dezekebewefe.weebly.com/uploads/1/3/4/7/134731304/nomipopozanusugan.pdf
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/936251.pdf
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/12c448a618e96bd.pdf
    • https://sexanugujox.weebly.com/uploads/1/3/4/2/134266496/8969498.pdf
    • https://gavaxavudo.weebly.com/uploads/1/3/4/5/134581950/7648794.pdf
    • https://juloxiwam.weebly.com/uploads/1/3/5/9/135967800/wimoj_lotad_nuxowakot_lalinowaxutomup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/224027c7-a041-4d77-a602-3a4263c73dbf/futhark_a_handbook_of_rune_magic_by_edred_thorsson.pdf
    • https://uploads.strikinglycdn.com/files/82a9fea7-daf6-4b96-a2dd-14e1e42773d7/how_to_use_bose_soundbar_700.pdf
    • https://uploads.strikinglycdn.com/files/c5319f84-e754-4429-9d50-b39cdc3af12d/vagurasukiwasus.pdf
    • https://uploads.strikinglycdn.com/files/04fada19-ff49-4bb5-a66a-ba05dd02628a/ruvalevi.pdf
    • https://uploads.strikinglycdn.com/files/0793ab3b-7474-47ad-ab5e-51dc79433f5b/vsphere_web_client_port_9443.pdf
    • https://uploads.strikinglycdn.com/files/83a63c52-09fe-42fa-bc30-b5013ab6e501/how_do_you_know_if_a_guy_is_interested.pdf
    • https://uploads.strikinglycdn.com/files/155c3944-469c-4e93-9d11-cfc58cf7c03d/vocabulaire_progressif_du_franais_niveau_dbutant_complet_gratuit.pdf
    • https://uploads.strikinglycdn.com/files/62b88cf9-8100-4c3f-876c-735f4fd501f8/54741440349.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_off0000e0a8.bin
fd342126e1c122593d28ee0b409c8e40674e1cd3475a8a78bd84467e41e1e4c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 4644 bytes
font_01_sfnt_off0000f06e.bin
b2223fa195fc98f7be53bfdd6c7729b043dc5c68cfd391c15b5ffc3af26eff55
pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 10940 bytes
font_02_sfnt_off000115ce.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 4324 bytes