Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f21050fbb20ad15…

MALICIOUS

PDF

76.7 KB Created: 2021-03-12 01:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5bf2b7a679bc50251c7503fc4bd129bc SHA-1: 4955aed7cde72be23f5da89b989ae661581dc01d SHA-256: 9f21050fbb20ad15fd77f99db2898e79a09e553d43eac79fefcb6e53c47ce989
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://leonvi.ru/award?keyword=aice+general+paper+textbook+pdf PDF link annotation
    • https://lipojiwogim.weebly.com/uploads/1/3/0/7/130776075/panezano.pdfIn PDF document text
    • https://tuwakunasuj.weebly.com/uploads/1/3/0/8/130874309/e1639.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/heart_disease_types.pdfIn PDF document text
    • https://monokuzofo.weebly.com/uploads/1/3/2/7/132741222/lizazofufag_dibanuruneviwi.pdfIn PDF document text
    • http://jiwujat.iblogger.org/dinilulalaramip.pdfIn PDF document text
    • https://riluvozig.weebly.com/uploads/1/3/4/3/134380056/2168625.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/0f50c91195.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/love_dare_book_free.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://naremijex.epizy.com/9391714588.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/motorola_elite_sliver_battery_replacement.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_91844b7cdf0a46f2bae8132f429265d0.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_3bd698442c5a4dc2bc4f175a798195cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pomaxa/subject_verb_agreement_worksheets_grade_5.pdfIn PDF document text
    • http://gewagopixinilu.rf.gd/33468660481.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/tavukikojafuta.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_c5eb0d4713904c2aac55480e0a4e27af.pdf?index=trueIn PDF document text
    • http://luwusifijusu.rf.gd/norerisirutejuzegagonesej.pdfIn PDF document text
    • http://lojupodinitaxug.epizy.com/xapuwubatedusetozun.pdfIn PDF document text
    • http://kitalanexu.epizy.com/audi_a7_2017_android_auto.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_3ee1f9a6c10f42269b8116434a6e9438.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wulagisi/infusible_ink_transfer_sheets_how_to.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/85036775312.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/toyota_camry_2020_price_used.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/black_and_decker_food_processor_parts_canada.pdfIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_c1bf67997e1e497ea816b0a3043fd717.pdf?index=trueIn PDF document text
    • http://kusababi.onlinewebshop.net/voiced_and_voiceless_sounds_chart.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_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 5192 bytes
SHA-256: 56d72b303f0b77527fd5d8d4e81a6fafb216466b03fa6c04663b559a0feb1732
font_01_sfnt_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 10112 bytes
SHA-256: 1824c8fcb547e7f1ff8e69d3d2b53d3ffb4b32d319b6a96930f1bb2c76febe35
font_02_sfnt_off000116f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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