Malicious PDF — malware analysis report

Static analysis result for SHA-256 e465ccb99d24ea5b…

MALICIOUS

PDF

87.3 KB Created: 2021-03-21 23:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 71a137d30a89080d7c352a4b5837817e SHA-1: b45030a2fd1345292030eecbf58af918a5384c04 SHA-256: e465ccb99d24ea5bc1d24ead8834e6ac0cb201aa8fdfb9cf8adc6fde72fa7af2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The embedded URL 'https://mezovuduw.ru/strik?utm_term=que+es+mutismo+selectivo+en+ni%25C3%25B1os' and the document's title indicate a deceptive lure to drive traffic to potentially malicious sites. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=que+es+mutismo+selectivo+en+ni%25C3%25B1os PDF link annotation
    • https://cdn.sqhk.co/neganobasiwe/hhBVtij/chamak_kannada_full_movie_2017.pdfIn PDF document text
    • https://givigifug.weebly.com/uploads/1/3/4/8/134858651/56ad4185e6f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477408/normal_6041d06cd9d42.pdfIn PDF document text
    • https://cdn.sqhk.co/vedoreket/3Ntuhaq/avatharam_songs_masstamilan_2019.pdfIn PDF document text
    • https://nojijakifon.weebly.com/uploads/1/3/4/0/134012839/8610e1dd.pdfIn PDF document text
    • https://guravigipide.weebly.com/uploads/1/3/2/8/132815190/tufejanu.pdfIn PDF document text
    • https://cdn.sqhk.co/potexunajo/cstjfCh/pocket_sniper_mod_apk_android_1.pdfIn PDF document text
    • https://xaforexu.weebly.com/uploads/1/3/0/7/130775472/5d5527848f38adb.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/j2ghhas/shaolin_kung_fu_styles.pdfIn PDF document text
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/16c774c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fe5ad2edc119.pdfIn PDF document text
    • https://wugizagopa.weebly.com/uploads/1/3/5/3/135311922/jubafamagol_lilax.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/RxGict4/journal_citation_reports_2018_economics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_6035471e905b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427091/normal_5fcea3ef94216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_600de7c132183.pdfIn PDF document text
    • https://gepemizuwawufak.weebly.com/uploads/1/3/4/3/134335313/9f9a73734.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/ebfc9a69-07fb-4e95-a263-e06de6badccd/jevutojawasezavabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e7dad1c-bc85-4c6b-bd34-195fbf22f42c/60750604735.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 4972 bytes
SHA-256: 0d67d41f11e22e65ecd70289663ad6a10d29846126038bb87966e9391767bed6
font_01_sfnt_off000111c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 11788 bytes
SHA-256: 1f272715027420dc2d512d8f84c2df7653b8051c353d90af71ae53c3c5e35ccc
font_02_sfnt_off0001383a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383A 16232 bytes
SHA-256: 68eef4b610644b6a98f668349b58b424e8310755c20c018328a8321db0e17a89