Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a33920471bf076…

MALICIOUS

PDF

86.1 KB Created: 2021-03-17 14:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8e64988dc2238fa6c9bf8e25352f1523 SHA-1: b4de1026c94bd767260c7df43d2a76c5365a0adb SHA-256: f4a33920471bf076b49040fbf14c3bcf3fa5980db13231abb93f634086509b07
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/wix?keyword=papa+louie+sushiria+cool+math PDF link annotation
    • https://lirodenagegoket.weebly.com/uploads/1/3/1/4/131437677/lurusulob_fowemuvokubakof_dulezopiso.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/eighdTN/censor_beep_10_hours.pdfIn PDF document text
    • https://sinepakeje.weebly.com/uploads/1/3/4/4/134490574/7376370.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/Zuha22K/38009144407.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/lagifegaxup.pdfIn PDF document text
    • https://lagepelod.weebly.com/uploads/1/3/4/7/134716456/257f7197b.pdfIn PDF document text
    • https://latapelubatute.weebly.com/uploads/1/3/5/9/135960370/rejowojarijewuj-faweva-vowosojun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_0c7495fbe97c4200923456cc84e58165.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad44d01b-27c5-4dc7-bdfb-e85603a02c78/how_big_is_omnisphere_2.6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c8d414-fda6-47c1-aef2-62b0c545656d/linear_signals_and_systems_lathi_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc79d983-2957-4a4e-96f6-9ff7d0f3a6c2/how_to_program_a_honeywell_vision_pro_8000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7e2f3e-402a-41f7-bd8e-4cc9fdf71082/63107017036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff24cb4-b429-4461-8ad5-06afb2f803d7/star_trek_beyond_cast_ensign_syl.pdfIn PDF document text
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_1edc56eb187c4fbd987bfb9e168a4c22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/62202155459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a531ba9-845a-4fa6-9ac0-00552457aae1/81682591278.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/51427670382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/103b5df4-4238-4322-9146-487e400dbb79/great_synonyms_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a57243-d777-47c4-b12d-d9f5f3d3f995/love_poems_in_spanish_with_english_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a26691-f124-4731-b326-fc3552d32c65/likirimanejuvizuzutuwub.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/madegojulugomiwe.pdfIn PDF document text
    • https://5b3a2631-baab-4d1f-8161-183aa5bfd7a2.filesusr.com/ugd/5dc2b7_5f0d74a7b4fe4d509a7ccac9cdecb2df.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 5176 bytes
SHA-256: a2df7aa045c70384f7f38cded79804dcb3bd8eef57ff862918e6d2ef309d91b6
font_01_sfnt_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 12820 bytes
SHA-256: 83a60a825fc5d4bcff45ec2fec1d61d36fcf0419b7e18b7d392326b135f2f0c6
font_02_sfnt_off00012eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 17384 bytes
SHA-256: 529c0782d36fea6c20af2936705234bb59f590e45b2ee45d435f5b5449f93362