Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ab3040fefaf2d9…

MALICIOUS

PDF

76.9 KB Created: 2021-04-01 07:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4ccc8610c46b39759e67c038bf178515 SHA-1: ee5d9761c38e751fee2015f09abb61c62c9d8cfe SHA-256: e8ab3040fefaf2d9f9e6066d7033d1c0050d8accef24d31827c1bb300ead6f84
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=how+to+make+a+truss+bridge+with+straws PDF link annotation
    • https://kiloxuloje.weebly.com/uploads/1/3/5/3/135398856/likomilumomej.pdfIn PDF document text
    • https://marademuwuzam.weebly.com/uploads/1/3/4/3/134396837/sodurawitosapibufopu.pdfIn PDF document text
    • https://gibejeki.weebly.com/uploads/1/3/1/4/131438187/f98aa.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/jdsHiej/sexevivuf.pdfIn PDF document text
    • https://cdn.sqhk.co/sesakiwewe/b5he1ia/20279929288.pdfIn PDF document text
    • https://gijepunudadolow.weebly.com/uploads/1/3/4/4/134497403/tazafewuxu_budewifixinud_kavepagorixa.pdfIn PDF document text
    • http://rimka.xyz/nidipewuwefevarunuderunuvhyy2b.pdfIn PDF document text
    • https://cdn.sqhk.co/nowagenika/idVbFjj/dragon_raja_classes_scythe.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/9Xujaih/rusalaw.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/hZ6ghTU/minecraft_mods_1._16.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/jcjdCii/10811273054.pdfIn PDF document text
    • https://dovinaturaxamij.weebly.com/uploads/1/3/5/3/135349119/df3eeaacfa6e540.pdfIn PDF document text
    • http://ionatr.fun/theory_of_justice_musicalec0xg.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/fiff2LH/35104458117.pdfIn PDF document text
    • https://vufuvato.weebly.com/uploads/1/3/4/7/134718288/e5faf705d57c02f.pdfIn PDF document text
    • http://handler-autoscout24.com/27605941245rgseg.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/iigcghP/bangla_to_english_dictionary_java_jar.pdfIn PDF document text
    • http://allfreebets.ru/lesson_4.1_practice_a_classifying_triangles319nw.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/a70c4638-b41e-49e0-b99d-2782804cc986/dusedefonasezonotupoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b7c2ef-76fd-4291-a8b2-7ba69ed9cccb/90020563537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69623299-ae55-4416-8665-f2de20c760b9/18634166045.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_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 5464 bytes
SHA-256: bec3df4b1832595ef75c9036a7a8e3e2ba26cabe4ccbe07f192372aa57ab2b3d
font_01_sfnt_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 10700 bytes
SHA-256: 9667eb24c7a9e4193f49a9640c3790d059a6a69a398fecc9caefbf8d131e5231