Malicious PDF — malware analysis report

Static analysis result for SHA-256 98740b9d18565787…

MALICIOUS

PDF

82.8 KB Created: 2021-04-25 14:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ebcef5b4818a8fc4da024c70c1dfd991 SHA-1: 2bb2e9839d5e16d653ac473153a9e893537e1290 SHA-256: 98740b9d1856578733038e68142439f0fddd65030b9ec6f8ea82089c06feab1b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'zajinet.ru/strik' which is indicative of a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to obscure the true destination through a network of disposable links. Although no scripts were extracted, the structure and URL patterns strongly suggest this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=in+the+summer+i+turned+pretty+series+who+does+belly+end+up+with PDF link annotation
    • https://cdn.sqhk.co/vumuwuxa/xhbheif/95561965252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466664/normal_602727bd7cdda.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/hg0Cjjh/earthlink_wifi_login.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/what_is_an_example_of_a_persuasive_essay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448547/normal_5fd6781f1a8a5.pdfIn PDF document text
    • http://pifadopagel.scienceontheweb.net/austempering_process.pdfIn PDF document text
    • http://tokudujadi.medianewsonline.com/vegepizuxusuwekukesafa.pdfIn PDF document text
    • http://rekijiwowak.scienceontheweb.net/peak_4.3_wireless_backup_camera_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_605f606d01728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_605c6effc4f03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tapelu/lunelepuker.pdfIn PDF document text
    • http://jomopizemiz.onlinewebshop.net/emergency_response_plan_for_industrial_action.pdfIn PDF document text
    • http://pupagerirawax.myartsonline.com/41363055541.pdfIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_8b816e81fa804c5caac03ad2b4faf55d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bojafazes/houghton_mifflin_math_answer_key_grade_6.pdfIn PDF document text
    • https://7b8833d7-014c-4875-9c37-56438ffeb98a.filesusr.com/ugd/ccf209_80ca7803e00c41fda3f737d9bed47f91.pdf?index=trueIn PDF document text
    • http://kijonag.onlinewebshop.net/wifininunox.pdfIn PDF document text
    • http://wusozupit.myartsonline.com/ada_2020_diabetes_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/how_to_play_skaven_blood_bowl.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/78580553036.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_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 5260 bytes
SHA-256: 3886d065f7f27935de8194ada28711116bb6af88dced5399b7e9094b67ef6705
font_01_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 3044 bytes
SHA-256: b9341405ec3442271264aaf80924ccadddc03b03f319061b428d7f5b393c4b9c
font_02_sfnt_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 11036 bytes
SHA-256: 7bf0c1fc186666ba7fe5d05ad76101da1f858d5a8f18272f52975b52afa76a99

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