Malicious PDF — malware analysis report

Static analysis result for SHA-256 281eabced0832d99…

MALICIOUS

PDF

78.6 KB Created: 2021-03-16 11:31:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c886bbc998f3fb49ab935f37d68be0cb SHA-1: bb5b0439a2f5050e61601ac7970623c1583ce71a SHA-256: 281eabced0832d99a4410aac557f23b73218d848a19413c48915b6f1800d4e54
186 Risk Score

Malware Insights

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

The PDF document contains a lure promising free gift cards, which is a common phishing tactic. It embeds multiple external links, with one pointing to a suspicious domain 'resalured.ru' that is likely part of a link farm designed to redirect users. The presence of numerous external links and the ML classifier's high confidence score indicate malicious intent, likely for phishing or malware distribution.

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://resalured.ru/wix?keyword=does+amazon+give+free+%25241000+gift+cards PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408460/normal_6012858769156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_600e23d3e7a75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480594/normal_6047ddcade3db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5fd6378c35d6d.pdfIn PDF document text
    • https://norulekilaj.weebly.com/uploads/1/3/4/7/134712763/dokijowezef.pdfIn PDF document text
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/jofuwekogaz-bukesisubig-birofefurujin-razaku.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/d6ef1cb8-2029-495b-a16a-e3838a78d032/38433264545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab66c89-b43a-414c-b24e-489cf9915e2a/nutimepimojamemujovevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d7a6e3-9766-40c6-8f6a-72985932fb68/susowurenofimakezadevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7a255f3-28fa-4176-bf9b-4e9d2e2ff01c/zombie_blastoise_pixelmon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b2a6253-80ea-49b7-8d04-7155c861fbb5/learn_english_grammar_step_by_step_in_gujarati.pdfIn PDF document text
    • http://wudotope.rf.gd/visukaxesivawiguzeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5107c025-1f52-42ac-a5c3-925c231c306b/41909613423.pdfIn PDF document text
    • http://zenijesadimikig.rf.gd/molopigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a3d13c-a78f-49cc-820e-1b6d408a7053/xufaranixakopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73206a0f-758e-41fd-a340-37f7e6dd020d/barney_stinson_bro_code_gif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b70c574-f7b2-4754-9725-bf3a562c88af/xutiligilojifum.pdfIn PDF document text
    • http://tegajapo.rf.gd/561052131.pdfIn PDF document text
    • http://vurisadazuxe.epizy.com/antiretroviral_drugs_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d9fb8fb-b544-4abb-a55b-50bd057699f6/suwerebatiraju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6b8dc3-b753-489a-a3d9-34c8e564c60d/american_history_x_movie_free_online.pdfIn PDF document text
    • http://buwozefavimim.epizy.com/33253628664.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_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 5848 bytes
SHA-256: baba005a8f0c07a5e97f58e65e40d2938184e4294e485847a52e2af301b84026
font_01_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 11568 bytes
SHA-256: 4bc01a3d26c21c83a531ad3b17dacefc1f4068464737eced75f8f6bb773937cc