Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e114fac870be16…

MALICIOUS

PDF

76.3 KB Created: 2021-03-12 15:34:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 507c7bc7a60654f412d3269c3aa6a8c1 SHA-1: 3b101675064f39efef09946acf66b74e67089b2a SHA-256: a0e114fac870be16da8875168ee759986bf3d19f930b62bbda9214ea4ef10a9c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL 'https://gimoguvi.ru/strik?utm_term=used+fly+tying+kits+for+sale' is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=used+fly+tying+kits+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415782/normal_5fe901137dc3d.pdfIn PDF document text
    • https://xulozajewe.weebly.com/uploads/1/3/1/3/131384688/taretategeku.pdfIn PDF document text
    • http://meetsucre.pro/liftmaster_learn_button_flashing_4_times1svfp.pdfIn PDF document text
    • http://safetymirrors.xyz/fluent_pythonzn5ye.pdfIn PDF document text
    • https://nofuxufemi.weebly.com/uploads/1/3/2/6/132681390/578773b60f16783.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446034/normal_5ffbdd8e76009.pdfIn PDF document text
    • https://reravonox.weebly.com/uploads/1/3/1/8/131856904/nubofujen.pdfIn PDF document text
    • https://nifogagerosore.weebly.com/uploads/1/3/5/3/135300162/jalatozugakog.pdfIn PDF document text
    • https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/6742fe0c51f96c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420031/normal_5ff2ef12b1348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_d88a42e4a01d42f286f3d200bdd55b1a.pdf?index=trueIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_51c6e8ba7cf14e698941540a7f4d87cd.pdf?index=trueIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_cebde9eac6674e12973738d5892a456b.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_ac7aa5f8224149e3819789660cf4c4e5.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_cd9be72b7e564ed4b30fe0a9258fe8c9.pdf?index=trueIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_2fb0a4bf1aaf4cf0bc9225f982eb6423.pdf?index=trueIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_19efbe1ff4784b0bbd8045ada85322f2.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_dfc17b8938d14c7aa744fa5500432351.pdf?index=trueIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_1a1f939a80e34564a57a5619848daeae.pdf?index=trueIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_74555f47e43e4d44a6c128a486972ec6.pdf?index=trueIn 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_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 5232 bytes
SHA-256: 284e0965ce9d3fc9678b6136d1a481ec4e3fd1df94c3b7dd28faacdfbcb4115a
font_01_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 9992 bytes
SHA-256: 2989fd422dafff8ab179efa9dff87c76baefae90dc03e8ad2e19549ed4e5d7c7