Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5aa61fa6c1196ff…

MALICIOUS

PDF

77.2 KB Created: 2021-03-10 08:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8afb16a3913ba797c119e20b346912c1 SHA-1: 8ee19e10e8b5ca510f81362b094db0d4354443cb SHA-256: e5aa61fa6c1196ffc02cef0f46c71bc7e90bb012606b4e2eb80353ec437a4192
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, many of which point to link farms and redirectors, indicating a phishing or SEO manipulation attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to malicious infrastructure. The presence of 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic to bypass security filters by instructing users to decrypt a payload, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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/wix?keyword=unblocked+games+btd3+hacked In PDF document text
    • http://domavera.ru/asterix_and_obelix_mission_cleopatra_englishqfexk.pdfIn PDF document text
    • http://iwhite.space/20689053412pilw6.pdfIn PDF document text
    • http://getsol.xyz/famous_fairy_tales_character_list1cmj3.pdfIn PDF document text
    • http://otshelnik.net/oxygen_not_included_beginner_guide_20195d6iz.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/where_can_i_buy_sodastream_co2_refills.pdfIn PDF document text
    • http://boreluto.22web.org/how_to_turn_on_summer_baby_monitor.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/how_to_reset_my_innova_3100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/695f9f64-91ba-4b07-bcbe-dd3f6c989738/fibugisuvigavi.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_b9595b7e55f0490381677d57cc65cf34.pdf?index=trueIn PDF document text
    • http://rivenoke.onlinewebshop.net/they_poured_fire_on_us_from_the_sky_quotes_with_page_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dabc000f-1abf-42da-a3ce-a960adbad38b/72171909111.pdfIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_0d221cedc8be4b0eac65697d30b3c75b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c372f059-5cad-42d2-8c60-d3ca2f36e122/kofonegavoxegelivixofipok.pdfIn PDF document text
    • http://lojogijenijuf.epizy.com/sap_bo_analysis_for_office.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d23353-0dbf-4793-9507-8fb646783a82/what_method_does_philosophy_of_nature_adopt.pdfIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_29618384996941c398211ddc5c91dd5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1bf8132-9955-4252-9127-62ec5dc51053/roku_3_remote_wont_pair.pdfIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_755e9b4e7d7e46e1a3f5d3fc4da23457.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6e0910-5b16-4bdb-a03a-00fba40a94bb/badamune.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 5356 bytes
SHA-256: c1694f783de0113d3315ed76a330d0075b2e27a609da79b6efac5404576b2db5
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 10216 bytes
SHA-256: 13b17b048e2d7e095cc5961e49515926e14a60bf4ebe6f15eaa3abfee1bb8999
font_02_sfnt_off000119af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3