Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ccfa31b7e45f68…

MALICIOUS

PDF

78.3 KB Created: 2021-06-03 02:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af674d301dbfc7240c3853ed7dc1b297 SHA-1: d4f236efdb2de358c3a8872465e31ab0af530a9b SHA-256: 76ccfa31b7e45f6898c1cbb7dfa486bde22cac67fc455a86253275c3dd89b3ab
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with one prominent URL being `https://archism.ru/pbw?utm_term=how+to+fill+annual+performance+appraisal`. This suggests a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://archism.ru/pbw?utm_term=how+to+fill+annual+performance+appraisal
    • https://cdn-cms.f-static.net/uploads/4444646/normal_606d0d6991334.pdf
    • https://wodirukuz.weebly.com/uploads/1/3/5/3/135398055/fb755ff6c.pdf
    • https://toziraza.weebly.com/uploads/1/3/4/5/134506396/170545.pdf
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/9367225.pdf
    • https://static.s123-cdn-static-d.com/uploads/4475375/normal_60b1b6597501d.pdf
    • https://cdn-cms.f-static.net/uploads/4387581/normal_6043eac8da89c.pdf
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/8978540.pdf
    • https://static.s123-cdn-static.com/uploads/4467945/normal_5fe4129694e00.pdf
    • https://cdn-cms.f-static.net/uploads/4366664/normal_60655b3052a7c.pdf
    • https://cdn-cms.f-static.net/uploads/4403673/normal_604d63cb0d5d2.pdf
    • https://regumalewa.weebly.com/uploads/1/3/4/6/134694163/mazuginufadojileno.pdf
    • https://degufulu.weebly.com/uploads/1/3/1/3/131379990/kugepolofoxiwuk-vogan-ligikazozoseno-dukumusiba.pdf
    • https://suxaniwaxunese.weebly.com/uploads/1/3/4/3/134385499/1241737.pdf
    • https://static.s123-cdn-static-d.com/uploads/4408721/normal_60b1fdfcd7dd1.pdf
    • https://pazopoxe.weebly.com/uploads/1/3/5/2/135293382/pemeva.pdf
    • https://lawuzifelive.weebly.com/uploads/1/3/4/0/134041442/d9fee7ae01.pdf
    • https://sawajarenemobo.weebly.com/uploads/1/3/4/4/134494328/95bb9d0667a4.pdf
    • https://cdn-cms.f-static.net/uploads/4501989/normal_6031bb1679883.pdf
    • https://batozovij.weebly.com/uploads/1/3/1/4/131455337/luzirativoj_vuwakusigagabu.pdf
    • https://cdn-cms.f-static.net/uploads/4368760/normal_601983b293b89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/abd239ed-be54-4428-af54-e7484bf791ac/how_do_you_adjust_a_pilot_unloader_valve.pdf
    • https://uploads.strikinglycdn.com/files/09aed9eb-6268-4d69-a6ad-02cedfe7d281/dn_dernek_2_full_indir_mobil.pdf
    • https://uploads.strikinglycdn.com/files/5632b579-ae8e-4073-84ae-cd5b077a3c93/lemutagimonov.pdf
    • https://uploads.strikinglycdn.com/files/861d014f-0738-42c8-9f26-504eda02d5f1/mokoguboveko.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_off0000f5a1.bin
2a51fb399ab1ab134df2fdc13f4840a4794cae11770be16acc34225920af9f0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 5212 bytes
font_01_sfnt_off0001075a.bin
cb2e37eb18bc956381852f7b71bcdcb32b45f4fc6d2fa27d2514500e26d0f56f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 10696 bytes