Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e144ed23c732ae…

MALICIOUS

PDF

84.1 KB Created: 2021-05-22 14:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 36c81f1a84ddd81654d1cc0cdd967a74 SHA-1: 2425c113901986b8f766f2fa8deeecb48d167956 SHA-256: 28e144ed23c732ae1fd156031723ccf92be0bc4d55e41f976eab2bc08484bfe3
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector link. The presence of a large link farm suggests an attempt to lure users to malicious sites. ClamAV also detected this as Pdf.Phishing.Trojan, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=are+dinosaurs+coming+in+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415334/normal_603874234b1fb.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/solupotor-joleti-jawegefe-momagemixeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451350/normal_5fe2c07c25ed6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444877/normal_5fd1fbc0ea37d.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/xipirebosifataf_bixoviw_rotezozaliv_retiguzule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_606449bc663ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5ff12ae1595bb.pdfIn PDF document text
    • https://xizenebijebis.weebly.com/uploads/1/3/2/3/132303300/9319421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5fe7028eb6245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387240/normal_5fed006a37c9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427097/normal_6008721e5c4d2.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/04e7c6cc-9dbf-4e17-819e-809611fb5b5c/jobs_in_pak_navy_may_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d598eab-ba0f-45c8-8b07-49da233d758d/the_bible_is_the_living_word_of_god_verse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab391bb7-c5c9-4bfe-99ae-43203ca05732/acer_aspire_v5_11.6_touch_screen_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e68cbf41-ba73-4f31-b138-1cf478198d5b/65051131569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e1082f8-4183-474c-97b1-ff98c80cdf79/bebozasip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a8fe34-fc6a-45aa-8e90-a3a664433004/99182674294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccef3dee-ee12-4235-9909-e1f300f88623/sarah_cynthia_sylvia_stout_poem_lesson_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9616c2-cf50-4f8d-a7d3-f873ee7b0352/el_poder_del_cristiano_est_en_la_oracin_msica_cristiana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c2d2516-10d0-45f9-8e49-5e9a2708d1a3/pali_canon_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347a2139-bdc9-41d8-9218-45d2377f6df1/is_uworld_alone_enough_for_step_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b3dfe5-79b6-4322-9d78-8eb1764bbe35/piwewamagefopave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bbe59d-d327-400d-92f9-7c915b501f4c/22887019144.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_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 5488 bytes
SHA-256: dcb0412f5150f7a9867377245f69c2097a0d14b56761c172eaede6849da0f95f
font_01_sfnt_off00011ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE5 10840 bytes
SHA-256: b5fae18776f27022a04126950ac0d8407d7700555c7529fd4e60837bf8ac7cfc