Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a63d8636cabb83f…

MALICIOUS

PDF

86.3 KB Created: 2021-02-12 14:27:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6c490763c98e736bd20a3eec47a0f6f3 SHA-1: d8ce9ab411bce22fd739319b1d76953597914f54 SHA-256: 4a63d8636cabb83ffab734b207df66405fa52dfeacd68f32bffa292fa6d7a17c
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were extracted, the presence of numerous suspicious URLs and the heuristic findings point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://jacksth.ru/wb?keyword=another%20eden%20mining%20guide PDF link annotation
    • http://idealslimitalia-oficial.site/79294982825kyi4h.pdfIn PDF document text
    • http://podarokinsta.site/drone_x_pro_manual0xtza.pdfIn PDF document text
    • http://familyit.pro/free_wso_course_downloaddruwi.pdfIn PDF document text
    • http://idealicaitalia.website/bush_s_baked_beans_nutritional_informationk5vjo.pdfIn PDF document text
    • http://golomashvanna.xyz/timex_clock_radio_t309t_manualgywnl.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/8ihigjj/polujipujolijuxeraxa.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/brownie_household_elf_badge_requirementsezhkx.pdfIn PDF document text
    • http://frankiearvelo.com/a_students_grammar_of_the_english_languagey67cf.pdfIn PDF document text
    • http://zufunepel.iblogger.org/grade_3_digital_time_worksheets.pdfIn PDF document text
    • http://onesmall.space/alcohol_120_full_crackblgay.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
    • http://gilesab.rf.gd/8898578533.pdfIn PDF document text
    • http://bakutogigu.rf.gd/zaletokeb.pdfIn PDF document text
    • http://difoduniba.epizy.com/ncis_los_angeles_cbs_episode_guide.pdfIn PDF document text
    • http://tinipukax.epizy.com/vidimekeziwegenevilu.pdfIn PDF document text
    • http://fevupepetifus.rf.gd/letter_k_words_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/bumagimibaroxozimujupev.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 6588 bytes
SHA-256: 4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72
font_01_sfnt_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 4692 bytes
SHA-256: 01f2729f57e5505fa6a0f12ced838a70b300a6faf928db1beb7197ac00d9ab35
font_02_sfnt_off00010689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 4268 bytes
SHA-256: bf204059caa07db75dc1ea580655b599d71721a0724be531ca9c13450d9f96ff
font_03_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 11100 bytes
SHA-256: a328f02b825f6e116e8cef50228599983f9995eb1b2c080bb54e6b21a921a010
font_04_sfnt_off00013be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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