Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa2a198701ebc97…

MALICIOUS

PDF

86.3 KB Created: 2021-06-02 13:39:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b604b4f65a94d32083e9ddd8748029dc SHA-1: c8f03f3c8e552e7640275eae2468e8be34543d69 SHA-256: 9aa2a198701ebc97322ac30fbccf1a1e824e8538983ccc46a5d6b4fad57dceea
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 0.9988

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://kuzutuzo.ru/123?utm_term=arunachalam+tamil+full+movie++moviesda PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445735/normal_6009cff565737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_604131347c627.pdfIn PDF document text
    • https://bufemiwod.weebly.com/uploads/1/3/4/8/134846302/sumovojojolavoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_605fb8f51efd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_6036c9cd6456a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484605/normal_60090a90ad40f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445866/normal_5fea078a6864d.pdfIn PDF document text
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/f1ca810d3d9af87.pdfIn PDF document text
    • https://wilubowedawiwo.weebly.com/uploads/1/3/4/5/134528918/de5cf7925.pdfIn PDF document text
    • https://tagopudul.weebly.com/uploads/1/3/5/3/135392217/fc834e6b6969e85.pdfIn PDF document text
    • https://witiderinusoj.weebly.com/uploads/1/3/1/4/131483097/8519030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_600f9ef3c7676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_604d019ad47ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479921/normal_60415f7fb8624.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368972/normal_5fe33342051f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477863/normal_5fe2b460554d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464077/normal_601d39bc71699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413244/vopekebepoxig.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144415326/msp_hack_generator_2019.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/63520162268.pdfIn PDF document text
    • http://neruwuk.pbworks.com/f/romomudokederoweg.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144413772/cheat_engine_ios_13_no_jailbreak_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000decd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 4152 bytes
SHA-256: fe1d963ed928ab634de6e76b9202ae218b55e8ef640e8d1b474313343900f0e9
font_01_sfnt_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 5312 bytes
SHA-256: ae15a64d522206a86957be4c60f86e1260ffb18d0610193e9fd85f566adda1c8
font_02_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 3764 bytes
SHA-256: 505aa21c90f6771e7b11484923cb8965de9e9dfce452b77b01ff8d3b2e818016
font_03_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 11400 bytes
SHA-256: 934e9b14b0fc9e6b53e467f6c30481d28391fdac88753574b9a948434f449ebf
font_04_sfnt_off000133a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A7 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15