Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e143ad171a40f69…

MALICIOUS

PDF

80.8 KB Created: 2021-03-27 17:40:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a1214f6c5d765b66c30e2d18338c93a SHA-1: d8ecf436ebc21d3d6638082b8ee837586610f948 SHA-256: 8e143ad171a40f69f3b27f76561acd1b0ed29b504c53cbafbcb242dcd90ec8ae
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests this PDF might be a precursor to delivering a password-protected archive, a common tactic to bypass security scans. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vilenefex.ru/strik?utm_term=when+a+company+sells+goods+to+customers+on+credit
    • https://dogenirifalalu.weebly.com/uploads/1/3/0/7/130775866/8feab63f62.pdf
    • https://lekipavovat.weebly.com/uploads/1/3/4/3/134332936/065f142c90d5d.pdf
    • https://static.s123-cdn-static.com/uploads/4484093/normal_5ffc3066c6a54.pdf
    • https://gikovasedubum.weebly.com/uploads/1/3/4/5/134507074/lebinakigu.pdf
    • http://lelusuje.22web.org/cell_organelles_and_their_functions_chart.pdf
    • https://mekapejodefab.weebly.com/uploads/1/3/4/7/134740006/tujadogudasiw_fuxuwibuzetojof_putasabox_rilolajijeke.pdf
    • https://nufawufaza.weebly.com/uploads/1/3/0/7/130740177/wezowuren.pdf
    • https://cdn-cms.f-static.net/uploads/4455901/normal_6052e128d6065.pdf
    • https://cdn-cms.f-static.net/uploads/4489412/normal_602c5ef3a72bb.pdf
    • https://static.s123-cdn-static.com/uploads/4498645/normal_5fe075cb7343d.pdf
    • http://kopusibujivir.iblogger.org/78560337030.pdf
    • http://wosidigelime.iblogger.org/payment_of_bonus_act_1965_in_marathi.pdf
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/zegub-sosiluvowodi-rafebavererama.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_3b7d6824a0d045e1bb689de038d5b727.pdf?index=true
    • https://b24036c1-08f6-4d5b-b8c9-f4c47f26e437.filesusr.com/ugd/ae9acc_42712d1715a74c0a9df5da3f2b0cb10d.pdf?index=true
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_c42845c7148b4367b22504976fa63f8a.pdf?index=true
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_d03af4a8e466447e92070b632cbcc09c.pdf?index=true
    • http://kodurubakasifi.epizy.com/18183113525.pdf
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_4c7f9ace35a843abae25820d813b81d7.pdf?index=true
    • http://nizegabimuremiv.rf.gd/data_analysis_tutorialspoint.pdf
    • http://rebokomixuxoj.epizy.com/how_to_study_for_ap_us_history_test.pdf
    • http://melewurimepuja.rf.gd/alesis_dm6_session_kit_manual.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_off0000f00f.bin
58f732f29321cc0e5ef61760b80e2bcc0911db793ca95f53f2d8c95c1401a1dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 5484 bytes
font_01_sfnt_off0001028e.bin
42ba2d8b090f055621e60be0ad7b33951260aebc9a8bbb175f73a4043abd324c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 10812 bytes
font_02_sfnt_off00012769.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12769 4324 bytes