Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad348a83dc6644ba…

MALICIOUS

PDF

77.9 KB Created: 2021-05-28 21:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0979d4523970f6aad0ff379d98cc02db SHA-1: 56a227c9c19543653302ed8ed9ed167717a63c82 SHA-256: ad348a83dc6644ba3a009cd032ece8f2efa4d473f922c9d4063313298aab9551
246 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. It impersonates Facebook, indicating a credential phishing attempt. The embedded links likely serve as redirects to a malicious page designed to steal user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://zedetebi.weebly.com/uploads/1/3/1/0/131070456/a7fe7c.pdf.
  • 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://druttle.ru/strik?utm_term=affidavit+of+loss+title+sample+philippines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474450/normal_6055be4b8ef01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450154/normal_5ffab98263149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5fd39fc352bdf.pdfIn PDF document text
    • https://zedetebi.weebly.com/uploads/1/3/1/0/131070456/a7fe7c.pdfIn PDF document text
    • https://zokejiwiperasuk.weebly.com/uploads/1/3/4/6/134668939/tazozoxabini.pdfIn PDF document text
    • https://gipoxafevipetim.weebly.com/uploads/1/3/1/3/131398102/rajegoviro-tixoxu-wafosoboto-soworevutisik.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/dibukokuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_604422c046add.pdfIn PDF document text
    • https://ruxelasukosife.weebly.com/uploads/1/3/4/6/134667582/rokixuzeze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416790/normal_6048d2f71c664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_6022eb31cb737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424013/normal_606b1decdca7b.pdfIn PDF document text
    • https://wupugosow.weebly.com/uploads/1/3/1/3/131382590/5953308.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5fe38c0bd1f34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487902/normal_5fd8f4aa4adbb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5178fc7-ee71-448b-86f3-168d93a15dbd/mokoposokusetitinux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0229f86a-db33-4f09-9a95-12419a02d6ad/fce_sample_test_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce2466a-bd5f-4de7-85cc-9fca59b7366c/12683491869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5ff7d4-fbc4-4ac3-bcb7-3f9eae651153/rodakuxupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd0f2f4-d35c-4de6-95a6-ba90f0990533/tribute_to_a_mother.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8ec6e0-a7a5-4c56-8737-f90f8d310af6/pefemisolojopoxajitone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48d0814-5f26-40c6-bbe9-d58ce0802adb/5793695809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ba9e6f-4ff9-4990-a266-36960698147b/43981852974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf89a251-32ff-4a01-926f-0603d73c2da4/best_photo_video_editor_for_pc.pdfIn 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_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 5232 bytes
SHA-256: aebb21ee5f0a26983e20bf082354cf011abae8423e6abd0c214bbea77efc150e
font_01_sfnt_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 10744 bytes
SHA-256: b82685463ebb3ab7f83a4634488cf7d087ca0203cf3ea205d0111a6ad605cd69