Malicious PDF — malware analysis report

Static analysis result for SHA-256 990d9bee6c7bffc7…

MALICIOUS

PDF

76.5 KB Created: 2021-05-30 17:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 039a6f2cbf8b0854da3cef7b19230217 SHA-1: dd59970dbc2260cd00004b3c22c78434119c0743 SHA-256: 990d9bee6c7bffc7958542d1f98c4ce02aab0a9270c391513fdff3e515bf8675
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://crophysi.ru/strik?utm_term=aha+bls+instructor+manual+2015+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465263/normal_5fe4f558339ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374840/normal_602532bae800a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409409/normal_604b2f0181804.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422637/normal_5ff7b9e4785ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_606da97e6415c.pdfIn PDF document text
    • https://duvokazi.weebly.com/uploads/1/3/4/1/134108747/75a5e879a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501037/normal_5feeef589daa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_606de8570e521.pdfIn PDF document text
    • https://miwefotuwid.weebly.com/uploads/1/3/0/9/130969826/dapelem.pdfIn PDF document text
    • https://navijaxilof.weebly.com/uploads/1/3/2/6/132696044/kolunutoret-jimasesukosif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490754/normal_5fc5a7cc71325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380209/normal_606a0d8ccc22f.pdfIn PDF document text
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/2499003.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480876/normal_5febb689137ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_601bc2678297d.pdfIn PDF document text
    • https://kinijanara.weebly.com/uploads/1/3/4/5/134585029/3298051.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406229/normal_5fcb14fb75804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5fd5f5e4a8806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_601f01111c2bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fa93584e-7d84-48fe-bcaa-cb72afebd5f0/does_chick_fil_a_have_good_mac_and_cheese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b85e79d-d4fe-4769-a45d-0449aaa88274/lg_direct_drive_washer_wont_drain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca2e653-c790-4171-b1d9-9affc69553a9/black_and_decker_20v_battery_charger_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/204036c3-6985-4847-8f90-7d5955f1d8b2/fender_passport_deluxe_pd-250_plus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 5736 bytes
SHA-256: 145f618faab8bd9439df434588a13abbaa90e6a1d93cd4150c34e1b0111b0c45
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 10972 bytes
SHA-256: 8743d8f575f845cff452924471bcfd76f84661ba28ec2522bda0917688f8ef23
font_02_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71