Malicious PDF — malware analysis report

Static analysis result for SHA-256 2edcd52e663fac62…

MALICIOUS

PDF

87.8 KB Created: 2021-04-05 05:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 094e2ab9b47babe1e9d76b4070e1a337 SHA-1: 71244ff5a68afa977de48df9fbedf100a85092e4 SHA-256: 2edcd52e663fac62fe3f241db852f65b24d90f10c921231d48d9fbe2de98dd27
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://jacksth.ru/123?utm_term=whatever+synonym+formal', which is likely used for phishing or to redirect to further malicious content. While no scripts were explicitly extracted, the presence of numerous links and the ClamAV detection suggest a malicious intent, possibly related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://jacksth.ru/123?utm_term=whatever+synonym+formal
    • http://haifaiv.ru/what_is_the_normal_a1c_for_diabeticsdzd02.pdf
    • https://cdn.sqhk.co/letijefa/jhjbnjb/wixonorateduzoguji.pdf
    • http://aydym.club/sisopabufebexami7yu4c.pdf
    • https://cdn.sqhk.co/feneradebeza/74ZjKjf/vufidupuxeluxixilapaxapot.pdf
    • http://ccckkkkk.space/70363313909t7ojp.pdf
    • https://cdn.sqhk.co/datolabevev/aidhj3A/find_my_old_friends_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_0b845d0f83644b90af3a071d5f4c998a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f0cd4102-f65e-4c34-a499-3c67dbfdbd79/world_map_with_latitude_and_longitude_markings_printable.pdf
    • https://uploads.strikinglycdn.com/files/73d53d8d-5c38-4c50-8b50-3766499cc4c3/763035693.pdf
    • https://s3.amazonaws.com/bolovopizonuki/xetewufap.pdf
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_8614b46b64594f0eb0c29e5533cffd9c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/28358e2d-50b6-4223-b78e-9868d260548a/fupesilitibuto.pdf
    • https://s3.amazonaws.com/nojemi/sesijonugovulimawesetuw.pdf
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_e2d27277ec064c2ab2222bd882734d13.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3803d169-b7dc-4330-abad-e735184363d9/java_mvc_framework_tutorial.pdf
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_169233690c45427d91001c2621cba234.pdf?index=true
    • https://uploads.strikinglycdn.com/files/45d51b5d-21f8-464d-bea6-46c78ffef30c/73555059885.pdf
    • https://uploads.strikinglycdn.com/files/4b889b6b-3c63-41e6-91ee-8dccdf38d6ab/list_at_least_three_important_purposes_of_writing_report_and_explain_them_brainly.pdf
    • https://uploads.strikinglycdn.com/files/66a5e025-0c6c-49c5-9e09-1d8058dc8597/can_i_get_a_new_remote_for_my_lg_tv.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_off000105cd.bin
7dccdf0056c7ef2ec0f44075d2992176384d21a16189434aa7665a669d45313c
pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 4924 bytes
font_01_sfnt_off0001166e.bin
cdff78715be8c44273d0030f7b4427b5b8dc043fc99207d9fcabfe65b2d8acc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 14216 bytes
font_02_sfnt_off00014419.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x14419 4324 bytes