Malicious PDF — malware analysis report

Static analysis result for SHA-256 4438e2734dd56304…

MALICIOUS

PDF

81.2 KB Created: 2021-04-04 15:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: eed735fa9bccff4f2a64c64960dd7233 SHA-1: 91c0c33f5bac93a083308729d16d9721fb4ba981 SHA-256: 4438e2734dd5630467129332881dad249b1538c245ec050284d3c0a4d9bcc895
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and contains metadata related to its creation, but the primary malicious activity appears to be the redirection to external, untrusted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=remington+700+adl+ss+308+review PDF link annotation
    • http://pumba-timon.space/commercial_lawn_care_proposal_templatern0y6.pdfIn PDF document text
    • https://zelerajolames.weebly.com/uploads/1/3/0/7/130776056/1041112.pdfIn PDF document text
    • https://kipidabivipili.weebly.com/uploads/1/3/4/3/134340994/zawuzen-rasebiron.pdfIn PDF document text
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/58ec69972867c.pdfIn PDF document text
    • http://vakimudefevu.22web.org/virginia_prentice_hall_mathematics_algebra_2_answers.pdfIn PDF document text
    • http://tradebot.space/kakimezegora897qe.pdfIn PDF document text
    • https://xamonato.weebly.com/uploads/1/3/2/8/132814301/kefezemilofibuw.pdfIn PDF document text
    • http://cosmostil.top/visej8mpvz.pdfIn PDF document text
    • http://abanca-electronica.com/cuisinart_dfp-14bcny_14-cup_food_processor_bladess4vpj.pdfIn PDF document text
    • http://kukushka.space/44059575417jlnbi.pdfIn PDF document text
    • http://maporivibadiwaj.iblogger.org/47141964212.pdfIn PDF document text
    • http://siondez.ru/elon_musk_rocket_launch_may_2020fgq46.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://s3.amazonaws.com/sojebelevenex/reliability_and_validity_of_research_instruments.pdfIn PDF document text
    • http://pemukusa.epizy.com/breeding_guide_dragon_city_legendary.pdfIn PDF document text
    • http://ladipuxot.rf.gd/jbl_boombox_manual.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/vesugofujipuzodafumoburu.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/architectural_case_study_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/data_mining_software_free.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_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 5672 bytes
SHA-256: 53e8bb4941038a9c2805a156670b4a194e5ca81443a326ff6f202bbfe46472ee
font_01_sfnt_off000105f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 10540 bytes
SHA-256: 59d4ba3a8c40307e2b44c9aeeff0b5e538a866a1174fb8ab827b94f7f32048c2
font_02_sfnt_off000129cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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